1. Structure of the Earth Not so solid Earth

2. The Earth has three levels: Core, Mantle, Crust

3. Is the center of the earth Consists of iron and nickel

5. Mantle Surrounds the core Consists of the earth’s mass Contains molten rock called magma

7. Crust Thin layer of rock at the earth’s surface

9. On and above the earth  Atmosphere  Lithosphere  Hydrosphere  Biosphere

11. Atmosphere A layer of gases surrounding the earth Contains the oxygen we breathe Protects earth from radiation and space debris Provides medium for weather and climate

13. Lithosphere  The outer shell of the earth  Includes the crust and uppermost mantle

19. Together, the hydrosphere, lithosphere, and atmosphere form the... biosphere

22. Continental Drift Theory Presented by Alfred Wegener Earth was once a supercontinent that divided and slowly drifted apart over millions of years Wegener called the supercontinent Pangea(all earth)

25. Do the continents continue to drift today?

26. How can the presence of seven continents on the earth's surface be explained?