Geology

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Across
  1. 4. The outer layer of the Earth, about 2-25 miles thick; crust is thicker under the continents and thinner under the oceans
  2. 5. Thick, gel like, sticky, not fluid
  3. 7. Theory of the Earth’s crust being broken into a series of plates in motion
  4. 8. Layer of molten rock between the crust and the Earth’s core, about 1,800 miles thick
Down
  1. 1. Boundary where plates are colliding into each other
  2. 2. Liquefied by heat, usually referring to lava or magma
  3. 3. The study of the earth
  4. 4. The center of the Earth, about 2,200 miles thick; made up of an inner and outer core
  5. 6. Boundary where plates are moving apart from each other
  6. 8. Molten rock containing dissolved gases beneath the Earth’s surface