Biogeochemical Cycles: Water, Carbon, Nitrogen and oxygen

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Presentation transcript:

Biogeochemical Cycles: Water, Carbon, Nitrogen and oxygen

The Water Cycle (Hydrologic Cycle) : The water cycle involves the movement of water back and forth from Earth’s surface to the atmosphere. Remember water can exist in 3 states: Solid, Liquid, and Gas

The Water Cycle: 3 basic Steps Water on the Earth’s surface is heated by the sun and evaporates. Water rises into the upper atmosphere, cools, condenses, and forms clouds. Water falls back to the surface as precipitation (rain, snow, sleet, or hail).

The Water Cycle: Key concepts Most precipitation falls back into the oceans, lakes, rivers, and streams. Water in the atmosphere is completely replaced once every 8 days Water on this planet can be stored in any one of the following reservoirs: atmosphere, lakes, rivers, oceans, groundwater, soil, and/or glaciers.

The Hydrologic Cycle

The Carbon and oxygen Cycle

The Carbon/Oxygen Cycle: Photosynthesis Photosynthesis - Plants use carbon dioxide (CO2) along with water and sunlight to produce glucose (sugar) and release oxygen 6H2O + 6CO2 C6H12O6 + 6O2

The Carbon/Oxygen Cycle: Respiration Respiration - Both plants and animals break down glucose (sugar) during respiration to obtain energy. C6H12O6 + 6O2 6H2O + 6CO2 glucose + oxygen water + carbon dioxide

The Carbon/Oxygen Cycle: Consumption Consumption: During their lifetime, animals pass along organic compounds from one another through feeding. Wastes produced during their lifetime are broken down by decomposers such as fungi and bacteria and carbon dioxide is added to the atmosphere.

The Carbon/Oxygen Cycle: Decomposition Decomposition - When living things die, these decomposers break down their organic compounds. Here again carbon dioxide is returned to the atmosphere.

The Carbon/Oxygen Cycle: Combustion Combustion: Any burning of fossil fuels (Oil, coal, natural gas) or wood…... or combustion releases the energy stored in these organic compounds and also large amounts of carbon dioxide

The Carbon/ Oxygen Cycle

The Nitrogen cycle: Key Concepts Plants and animals (all living things) need nitrogen to make proteins. Plants cannot absorb nitrogen (N2) from the air. Bacteria in the soil convert unusable (N2) from the air into nitrates (NO3) that plants can use to make their proteins. Animals eat plants to get their proteins.

The Nitrogen Cycle

Acid rain is part of the nitrogen cycle