1. Unit 3 Lesson 1: Earth’s Support of Life and Lesson 2: Natural Resources

2. Living It Up What do living things need to survive?
Air to breathe
Water to drink
Energy from food
Habitat – a place to live and provide protection.
The Earth and Sun interact to support life on Earth.
Plants use the sun’s energy to make their own food through photosynthesis.
Photosynthesis – Plants take in sunlight energy + CO2 + water and they give off oxygen + sugar (food).

3. Photosynthesis

4. Water, water Everywhere
How did earth get its water?
Earth formed from molten materials like, Iron, Nickel, and Silica.
These materials separated into layers and began to cool.
As Earth cooled it released steam and other gases into the atmosphere.
The steam formed clouds, and water fell to Earth as rain.
This formed the oceans.
Some also came from icy comets and meteors from space.

5. Formation of Water
About 71% of earth’s surface is now covered with water.

6. Security blanket
Atmosphere – a mixture of gases that surround a planet, moon, or other space object.
Most space objects have atmospheres.
Mercury and the moon do not have atmospheres because gravity is much weaker and is not strong enough to hold the gases in place.
Carbon dioxide and oxygen support most forms of life on Earth.

7. Security blanket Gases Insulate Earth
Solar radiation passes through the atmosphere and is absorbed by earth’s surface.
Radiation energy moves into the atmosphere.
Greenhouse Effect – radiation energy is absorbed and re-radiated by atmospheric gases. Traps the solar heat!
The greenhouse effect keeps Earth warmer than it would be if earth had no atmosphere.

8. Security blanket The Ozone Layer Protects Earth
Ultraviolet radiation – A type of solar radiation that can harm life.
It is harmful; it can damage the genetic make-up (genes or DNA) in organisms.
Earth’s ozone layer blocks most UV Radiation.
Ozone – a molecule that is made up of 3 oxygen atoms – makes up the ozone layer.
It helps reflect UV Radiation
Some human made chemicals have damaged the ozone layer.
Like CFC (chloro fluoro carbons)

9. Unit 3: Lesson 2 Natural Resources

10. It’s Only Natural What are Natural resources?
Any natural material that is used by humans.
Include: air, soil, minerals, water, oil, plants, animals, wind.
All energy comes from the sun – it is then transferred into different forms.
Earth’s resources produce products that make people’s lives more convenient.
There are 2 categories: Renewable
2. Nonrenewable

11. Renewable Resources
Renewable resources – a natural resource that can be replaced at the same rate at which it is consumed.
Can be replaced in a short period of time.
Solar energy
Air
Water
Trees (wood/paper) and crops –
sometimes trees are cut
down faster than they can
regrow.

12. Nonrenewable Resources
Nonrenewable Resource – A resource that forms much more slowly than it is consumed.
Takes millions of years to regenerate.
Include fossil fuels
Fossil fuels – nonrenewable; formed from the buried remains of plants and animals that lived long ago.
Examples include: Coal, oil, and natural gas.
The original source of all energy comes from the sun.

14. A Material World
Material Resources – are natural resources that are used to make objects, food, or drinks.
Can be renewable or nonrenewable
To Make Food or Drink
Wheat
Corn
Milk
Cheese
Eggs
Meat from animals
Water
To Make Objects
Steel
Plastic
Rubber
Glass
Leather
Iron
Oil
Sand

15. Change It Up How do we use energy resources?
Energy resources – are natural resources that are used to generate energy.
2 types
Potential energy – stored energy
- Examples include food, gasoline, any non moving object.
Kinetic energy – energy of movement
Anything in motion.
Potential energy is converted into Kinetic energy

16. Law of Conservation of Energy
Energy cannot be created or destroyed but it can be transferred from one form to another.
Electrical energy to heat
Electrical energy to light and sound energy
Electrical energy to kinetic energy