Earths layers

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Across
  1. 3. the layer we stand on and the top layer
  2. 5. the rigid outer part of the earth, consisting of the crust and upper mantle.
  3. 7. heat causing the rocks to rise and fall
Down
  1. 1. the 3rd layer and the closets to the center and the only liquid layer
  2. 2. The _______ is about 2,900 kilometers (1,802 miles) thick, and makes up 84% of Earth's total volume.
  3. 4. geologists use these waves to help figure out what is inside of earth.
  4. 6. the very middle of the earth and the layer that nobody has or ever will see