1. The Biosphere, atmosphere, hydrosphere and lithosphere

2. Earth Roughly 4.5 billion years old
Third planet orbiting around the sun
Only planet in our solar system to have surface liquid water
Home to the only known life in the universe

3. Internal Structure of Earth

4. Biosphere Regions in which life can exist Made up of 3 parts
Atmosphere (air)
Hydrosphere (water)
Lithosphere (rock and sediments)

5. Atmosphere
The gases that envelope and surround the Earth make up our atmosphere
Protects us from UV rays
Balances the global temperature on the Earth
Made up of various gases (Nitrogen, oxygen, water vapour, Carbon dioxide, Ozone, etc...)

6. Layers of the atmosphere
Troposphere : contains 80% of all air Stratosphere: absorbs UV rays Mesosphere: Protects Earth from meteorites Thermosphere: Most meteorites burn up here.

7. Ozone
Protects us from UV rays Destroyed by CFCs (chloroflurocarbons) and aerosol products.

8. Hydrosphere

10. Fresh Water

11. Fresh Water
Lakes, ponds, rivers, and streams are freshwater habitats. So too are swamps, bogs, and marshes.
It amounts to precious little water, less than half a percent of the world's water supply.
Yet it is essential to a wide variety of life on earth.
The distribution of fresh water in uneven globally. Four countries hold nearly 50% of all the fresh water on Earth.

13. Salt water
The water of the seas and oceans is salty because of the vast quantity of mineral salts dissolved in it.

14. Lithosphere
Comprises the Earth’s crust and part of the upper mantle

15. Rocks and minerals
A rock is a heterogeneous blend of various grains (each grain is a mineral)
A mineral is a pure, natural and inorganic substance

16. QUESTIONS 1. About how old is the earth?
2. What number planet is the earth from the sun?
3. Which planet in our solar system is the only one with liquid water?
4. What layers make up the internal structure of the earth?
5. What three parts make up the Biosphere?

17. QUESTIONS (CONTINUED)
6. List two things the atmosphere does for our planet? 7. What gases make up the atmosphere? 8. What five layers make up the atmosphere? 9. What two things does the Ozone do for our planet? 10. What is the hydrosphere? 11. List the distribution of water on earth.