1. Do Now: Describe the difference between the two shapes below.

2. 2

4. Earth's Shape 4

5. Is the Earth flat? 5

6. Square? 6

7. List 3 things that you see!7

8. Is the Earth a perfect sphere?
The Earth’s true shape is an oblate spheroid
It is slightly flattened at the poles and slightly bulging at the equator. 8

9. However, if drawn to scale, it looks like a perfect sphere!9

10. 10

13. What are the two most common elements in the crust?

14. Spheres of the Earth: Lithosphere
The part of the Earth that is solid (the land)

15. Parts of the Lithosphere:
What could cause the oceanic crust to sink under the continental ctust??????
Continental Crust – thick
Oceanic Crust - thin

17. Hydrosphere The water on the Earth
The hydrosphere covers 75% of the Earth

18. What are the two most common elements in the Hydrosphere?

19. Atmosphere The air (gases) that we breathe
What is the most common gas we breathe?

20. Air is made up mostly of Nitrogen (78%) and Oxygen (21%)
What is the most common element in the atmosphere (troposphere)?

22. Troposphere

23. Stratosphere

24. Mesosphere

25. Thermosphere

28. EARTHS INTERIOR

32. What layers make up the Earth’s interior?
Crust: Solid layer of oceanic and continental rock
Mantle: Layer of hot dense rock that the crust floats upon.
Outer core: Layer of liquid Iron and Nickel
Inner core: Solid layer of Iron and Nickel

35. How do speed cameras know how fast your going????