1. Two main ways scientists collect information about the Earth is by into it and by using information.
2. Earth is made of three layers; the , the , and the .
3. The outer layer of the Earth is called the .
4. The deepest hole on earth is 12 kilometers or 40,000 feet deep & only goes into the . We have been able to dig a hole through the crust.
5. The crust is made up of different kinds of rock, but the two main types are and .
6. Ocean crust is made only of . (basalty)
7. elements make up more than 90 percent of the crust; , silicon, aluminum, iron, and calcium.
8. Another name for the crust is the , the solid portion of the Earth.
9. The scientists believe that Earth’s crust, or , is into several segments or .
10. The Earth’s surface can be divided into of crust, crust and crust.
11. crust is found under the landforms or and is usually about thick; however, it may be up to thick in mountainous areas.
12. The upper part of is made up of and the lower part is basalt.
13.The of the crust goes from Celsius at the surface to Celsius at the bottom.
14. is much than continental crust. It averages only thick.
15. is only made of basalt which is much than continental crust.