1. Earth’s Structure
The egg that you live on

2. Parts of the earth
Hydrosphere- water makes up about 70% of the earth’s surface.
Lithosphere- the earth’s rocky, outermost layer.

3. Parts of the Earth
Atmosphere- the layer of gases surrounding the earth.
Biosphere- the area on or near the earth’s surface that supports plant & animal life.

4. Earth’s Structure Core- mostly iron & nickel.
Mantle- a layer of semi-solid rock around the core; 1800 miles thick.
Crust- thin, rocky surface layer; 4 to 45 miles thick.

5. Convection Currents
The heating & cooling of the mantle that causes the crust to move.
Internal force responsible for building new landforms.

6. Plate Tectonics
The theory that the earth’s outer shell is not one solid piece of rock but is broken into a number of moving plates.

7. Continental Drift
The theory that the continents were once part of one large landmass & moved to their present positions after millions of years.