Question

Fill in the blanks:
1) The ___ is the sphere of life
2) ____ waves help to determine the structure of the earth.
3) The average thickness of the earth's crust is about___km.​

Answer 1

Answer:

3)The layers of Earth are: Crust - 5 to 70 km thick. Mantle - 2,900 km thick. Outer Core - 2,200 km thick

Answer 2

Answer:

1. The earth is the sphere of life.
2. seismic waves help to determine the structure of the earth
3. the average thickness of the earth crust is about 15 km to 20 km

Explanation:

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