3 Earth’s Environmental Systems CHAPTER

The Gulf of Mexico’s Dead Zone Nutrient-rich runoff causes plankton blooms and hypoxia—low oxygen levels—in the Gulf of Mexico. Hypoxia kills or displaces marine organisms, causing a decline in the fisheries and the fishing industry. U.S. government and farmers debate the need to cut down on fertilizer use. Nutrient-rich runoff causes plankton blooms and hypoxia—low oxygen levels—in the Gulf of Mexico. Hypoxia kills or displaces marine organisms, causing a decline in the fisheries and the fishing industry. U.S. government and farmers debate the need to cut down on fertilizer use. Talk About It Do you think the distance between the source of the nitrogen and phosphorus and the dead zones themselves makes it difficult to manage this problem? Why or why not?

Lesson 3.1 Matter and the Environment Water’s abundance is a primary reason there is life on Earth.

Atoms and Elements Atoms are the basic unit of matter. Nucleus: Contains protons and neutrons Electrons: Move around the nucleus An element is a substance that cannot be broken down into other substances. Atoms are the basic unit of matter. Nucleus: Contains protons and neutrons Electrons: Move around the nucleus An element is a substance that cannot be broken down into other substances. Did You Know? There are 92 elements that occur naturally, and scientists have created about 20 others in labs. Lesson 3.1 Matter and the Environment

What are the basic units of matter? A.Elements B. Atoms C. Electrons D.Neutrons E.Protons A.Elements B. Atoms C. Electrons D.Neutrons E.Protons

Bonding Atoms combine by bondingAtoms combine by bonding: Covalent bonds: Electrons are shared. Ionic bonds: Electrons are transferred. Molecule: Two or more atoms joined by covalent bonds Compound: Substance composed of atoms of two or more different elements Lesson 3.1 Matter and the Environment Covalent bonding Ionic bonding

When electrons are transferred what type of bond is it? A.Covalent B.Ionic C.Molecule D.Compound E.Atomic A.Covalent B.Ionic C.Molecule D.Compound E.Atomic

Organic and Inorganic Compounds Organic compounds: Consist of covalently bonded carbon atoms and often include other elements, especially hydrogen Hydrocarbons: Organic compounds, such as petroleum and wood smoke, that contain only hydrogen and carbon Inorganic compounds: Lack carbon-to-carbon bonds Organic compounds: Consist of covalently bonded carbon atoms and often include other elements, especially hydrogen Hydrocarbons: Organic compounds, such as petroleum and wood smoke, that contain only hydrogen and carbon Inorganic compounds: Lack carbon-to-carbon bonds Lesson 3.1 Matter and the Environment Organic compounds include natural gas, petroleum, coal, and gasoline.

Which of the following is NOT an organic compound A.Petroleum B.Natural gas C.Coal D.Gasoline E.Ammonia A.Petroleum B.Natural gas C.Coal D.Gasoline E.Ammonia

Solutions A mixture is a combination of elements, molecules, or compounds that are not bonded chemically. Solutions are mixtures in which all ingredients are equally distributed. Mixtures can be solids, liquids, or gases. A mixture is a combination of elements, molecules, or compounds that are not bonded chemically. Solutions are mixtures in which all ingredients are equally distributed. Mixtures can be solids, liquids, or gases. Lesson 3.1 Matter and the Environment Blood, sea water, plant sap, and metal alloys, such as brass, are all solutions.

Macromolecules Large organic compounds that are essential to life Proteins: Serve many functions in organisms; include C, H, O, N, S; may help with production of tissues, store energy, act as hormones, or serve as enzymes Nucleic Acids: Direct protein production; include DNA (carries hereditary info and is responsible for passing on traits) and RNA (copies DNA to make protein) Carbohydrates: Provide energy and structure; include sugars, starch, and cellulose (C, H, O) Lipids: Not soluble in water; many functions; include fats, waxes, and hormones; not a polymer Large organic compounds that are essential to life Proteins: Serve many functions in organisms; include C, H, O, N, S; may help with production of tissues, store energy, act as hormones, or serve as enzymes Nucleic Acids: Direct protein production; include DNA (carries hereditary info and is responsible for passing on traits) and RNA (copies DNA to make protein) Carbohydrates: Provide energy and structure; include sugars, starch, and cellulose (C, H, O) Lipids: Not soluble in water; many functions; include fats, waxes, and hormones; not a polymer Lesson 3.1 Matter and the Environment

Which of the following is NOT a macromolecule A.Proteins B.Nucleic Acid C.Carbohydrates D.Atoms E.Lipids A.Proteins B.Nucleic Acid C.Carbohydrates D.Atoms E.Lipids

Water Water is required by all living things for survival. Polar molecule: shared electrons are not evenly distributed Oxygen end is more negative Hydrogen bond: an oxygen atom of a water molecule is weakly attracted to one or two hydrogen atoms of another Water is required by all living things for survival. Polar molecule: shared electrons are not evenly distributed Oxygen end is more negative Hydrogen bond: an oxygen atom of a water molecule is weakly attracted to one or two hydrogen atoms of another Lesson 3.1 Matter and the Environment

Water Hydrogen bonding gives water many unique properties: Cohesion Water sticks to itself Allows the transport of materials, like nutrients and waste, in plants and animals Resistance to temperature change Water can absorb a large amount of energy with only small changes in its temperature Helps stabilize aquatic ecosystems and climates in which they exist Ice density Water molecules in ice are farther apart than in liquid water Less dense when frozen Universal solvent: Ability to dissolve many other molecules Hydrogen bonding gives water many unique properties: Cohesion Water sticks to itself Allows the transport of materials, like nutrients and waste, in plants and animals Resistance to temperature change Water can absorb a large amount of energy with only small changes in its temperature Helps stabilize aquatic ecosystems and climates in which they exist Ice density Water molecules in ice are farther apart than in liquid water Less dense when frozen Universal solvent: Ability to dissolve many other molecules Lesson 3.1 Matter and the Environment

Which property of water allows it to stick to itself? A.Ice density B.Universal Solvent C.Cohesion D.Resistance to temperature E.Buoyancy A.Ice density B.Universal Solvent C.Cohesion D.Resistance to temperature E.Buoyancy

Acids, Bases, and pH The separation of water molecules into ions causes solutions to be acidic, basic, or neutral. The pH scale measures how acidic or basic a solution is. pH of 7—Neutral: Equal concentrations of H + and OH - pH below 7—Acidic: Relatively high concentration of H + pH above 7—Basic: Relatively high concentration of OH - The separation of water molecules into ions causes solutions to be acidic, basic, or neutral. The pH scale measures how acidic or basic a solution is. pH of 7—Neutral: Equal concentrations of H + and OH - pH below 7—Acidic: Relatively high concentration of H + pH above 7—Basic: Relatively high concentration of OH - Lesson 3.1 Matter and the Environment

Lesson 3.2 Systems in Environmental Science Positive feedback loops can help erosion turn a fertile field to desert in just a few years. Dust storm, Stratford Texas, 1930s

Interacting Systems Lesson 3.2 Systems in Environmental Science Inputs into Earth’s interconnected systems include energy, information, and matter. Feedback loops - regulate systems – circular process that describes how an event is both a cause and an effect in the same system Negative feedback loops: Result in stabilization of a system Positive feedback loops: Result in a system moving to an extreme Did You Know? Predator-prey cycles are negative feedback loops. If prey populations rise, predator populations can rise in response, causing prey populations to fall. Then predator populations may decline, allowing prey populations to rise again, and so on. Negative feedback loop

Which of following results in the stabilization of a system? A.Positive feedback loop B.Feedback Loop C.Neutral Feedback Loop D.Negative Feedback Loop E.Feedback system A.Positive feedback loop B.Feedback Loop C.Neutral Feedback Loop D.Negative Feedback Loop E.Feedback system

Identify and explain if it is a negative or positive feedback loop You get a rash from poison ivy. You know you shouldn't scratch it, but it itches. So you scratch. But scratching makes it itch more, and can even make the rash spread to areas that didn't itch before. The more you scratch, the more it itches.

Identify and explain if it is a negative or positive feedback loop The thermostat attached to an air conditioner helps maintain a constant temperature in your house. During the summer, the sun heats the house and the temperature goes up. When the temperature goes up, the thermostat turns on the air conditioner, causing the house to cool down. When the house is cool again, the thermostat turns the air conditioner off.

Identify and explain if it is a negative or positive feedback loop In the picture below, blood pressure has increased. Receptors in the carotid arteries detect the change in blood pressure and send a message to the brain. The brain will cause the heart to beat slower and thus decrease the blood pressure.

Identify and explain if it is a negative or positive feedback loop My mom had a blood clot at the age of 40. Once a vessel is damaged, platelets start to cling to the injured site and release chemicals that attract more platelets. The platelets continue to pile up and release chemicals until a clot is formed.

Identify and explain if it is a negative or positive feedback loop Regulation of blood sugar in humans - When blood sugar rises, insulin sends a signal to the liver, muscles and other cells to store the excess glucose. Some is stored as body fat and other is stored as glycogen in the liver and muscles.

Identify and explain if it is a negative or positive feedback loop Carbon dioxide is considered a "greenhouse gas" since it absorbs heat that would otherwise dissipate out into space. If there is more carbon dioxide in the atmosphere, global temperatures are likely to increase. It is possible that plants will respond to the increased carbon dioxide and increased temperatures with an increase in photosynthesis. Since carbon dioxide is needed for photosynthesis, this could reduce the amount of carbon dioxide in the atmosphere, leading to cooler temperatures. Is this a positive or negative feedback loop?

Identify and explain if it is a negative or positive feedback loop Here are some examples related to ecosystems and global climate change. Ice caps at the north and south poles are very reflective -- the ice reflects light and heat rather than absorbing it. If global warming occurs, then the increase in temperature will cause polar ice to melt, and the bare dark ground will absorb rather than reflect heat. This additional absorption of heat will further boost the temperature of the earth. Is this a positive or negative feedback loop?

Spheres of Function Earth can be divided into spheres that are defined according to their location and function. Lesson 3.2 Systems in Environmental Science

Lesson 3.3 Earth’s Spheres The movement of Earth’s plates has formed the deepest ocean trenches and the highest mountains.

The Geosphere Crust: Thin, cool, rocky outer “skin” Mantle: Very hot and mostly solid Core: Outer core is molten metal, inner core is solid metal Crust: Thin, cool, rocky outer “skin” Mantle: Very hot and mostly solid Core: Outer core is molten metal, inner core is solid metal Lesson 3.3 Earth’s Spheres Rocks and minerals on and below Earth’s surface: Rock formation, Ouray National Wildlife Refuge, Utah

Plate Tectonics Crust and mantle are divided into: Lithosphere: Crust and uppermost mantle; divided into tectonic plates Asthenosphere: Soft middle mantle; heated by outer core Lower mantle: Solid rock Convection currents in the asthenosphere move tectonic plates. Collisions and separations of the plates result in landforms. Crust and mantle are divided into: Lithosphere: Crust and uppermost mantle; divided into tectonic plates Asthenosphere: Soft middle mantle; heated by outer core Lower mantle: Solid rock Convection currents in the asthenosphere move tectonic plates. Collisions and separations of the plates result in landforms. Lesson 3.3 Earth’s Spheres Volcano lava

Tectonic Plates There are three major types of plate boundary: Divergent Transform Convergent There are three major types of plate boundary: Divergent Transform Convergent Lesson 3.3 Earth’s Spheres

Divergent and Transform Plate Boundaries Divergent boundaries: Rising magma pushes plates apart. Transform boundaries: Plates slip and grind alongside one another. Divergent boundaries: Rising magma pushes plates apart. Transform boundaries: Plates slip and grind alongside one another. Lesson 3.3 Earth’s Spheres Divergent plate boundary Transform plate boundary

Convergent Plate Boundaries Plates collide, causing one of two things to happen: Subduction: One plate slides beneath another. Mountain-building: Both plates are uplifted. Plates collide, causing one of two things to happen: Subduction: One plate slides beneath another. Mountain-building: Both plates are uplifted. Lesson 3.3 Earth’s Spheres

Biosphere: The part of Earth in which living and nonliving things interact Atmosphere: Contains the gases that organisms need, such as oxygen; keeps Earth warm enough to support life Biosphere: The part of Earth in which living and nonliving things interact Atmosphere: Contains the gases that organisms need, such as oxygen; keeps Earth warm enough to support life The Biosphere and Atmosphere Lesson 3.3 Earth’s Spheres Earth’s atmosphere, seen from space

The Hydrosphere Consists of Earth’s water Most of Earth’s water (97.5%) is salt water. Only 0.5% of Earth’s water is unfrozen fresh water usable for drinking or irrigation. Earth’s available fresh water includes surface water and ground water. Consists of Earth’s water Most of Earth’s water (97.5%) is salt water. Only 0.5% of Earth’s water is unfrozen fresh water usable for drinking or irrigation. Earth’s available fresh water includes surface water and ground water. Lesson 3.3 Earth’s Spheres Did You Know? If it is depleted, groundwater can take hundreds or even thousands of years to recharge completely. Greenlaw Brook, Limestone, Maine

The Water Cycle Lesson 3.3 Earth’s Spheres

Which of the following spheres contains rocks and minerals below earth’s surface? A.Biosphere B.Crust C.Lithosphere D.Atmosphere E.Geosphere A.Biosphere B.Crust C.Lithosphere D.Atmosphere E.Geosphere

What type of boundary occurs when rising magma pushes plates apart A.Transform B.Divergent C.Convergent D.Mountain-building E.Subduction A.Transform B.Divergent C.Convergent D.Mountain-building E.Subduction

What type of boundary occurs when plates collide? A.Divergent B.Transform C.Convergent D.Subduction E.Mountain-Building A.Divergent B.Transform C.Convergent D.Subduction E.Mountain-Building

The part of Earth in which living and non living things interact occurs in which sphere? A.Hydrosphere B.Biosphere C.Atmosphere D.Lithosphere E.Geosphere A.Hydrosphere B.Biosphere C.Atmosphere D.Lithosphere E.Geosphere

Lesson 3.4 Biogeochemical Cycles A carbon atom in your body today may have been part of a blade of grass last year, or a dinosaur bone millions of years ago. Fossilized bones in a Colorado dig.

Nutrient Cycling Matter cycles through the environment. Matter can be transformed, but cannot be created or destroyed – Law of Conservation of Matter Nutrients, matter that organisms require for life process, circulate throughout the environment in biogeochemical cycles. Matter cycles through the environment. Matter can be transformed, but cannot be created or destroyed – Law of Conservation of Matter Nutrients, matter that organisms require for life process, circulate throughout the environment in biogeochemical cycles. Lesson 3.4 Biogeochemical Cycles Did You Know? Organisms require several dozen nutrients, such as nitrogen, phosphorus, and carbon, to survive.

Nutrient Cycling Biogeochemical cycles – nutrients cycle endlessly throughout the environment in complex cycles Carbon Phosphorus Nitrogen The water cycle also plays a part in all biogeochemical cycles Biogeochemical cycles – nutrients cycle endlessly throughout the environment in complex cycles Carbon Phosphorus Nitrogen The water cycle also plays a part in all biogeochemical cycles Lesson 3.4 Biogeochemical Cycles Did You Know? Organisms require several dozen nutrients, such as nitrogen, phosphorus, and carbon, to survive.

The Carbon Cycle Lesson 3.4 Biogeochemical Cycles

The Phosphorus Cycle Lesson 3.4 Biogeochemical Cycles

The Nitrogen Cycle Lesson 3.4 Biogeochemical Cycles

Which of following is NOT a macronutrient A.Carbon B.Phosphorus C.Hydrogen D.Nitrogen A.Carbon B.Phosphorus C.Hydrogen D.Nitrogen

Which cycle relies on bacteria? A.Phosphorus B.Carbon C.Nitrogen D.Cell Respiration E.Photosynthesis A.Phosphorus B.Carbon C.Nitrogen D.Cell Respiration E.Photosynthesis