Layers of Earth

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Across
  1. 3. The solid, ductile (plastic) region in the upper mantle just below the lithosphere. It flows slowly like soft putty or warm asphalt, allowing tectonic plates to slide over it
  2. 4. The thickest layer (about 68% of Earth's mass) made of hot, dense, dark silicate rock
  3. 5. The outermost, thinnest solid shell of the Earth (less than 1% of Earth's mass).
  4. 6. The innermost metallic sphere (about 31% of Earth's mass) composed mostly of iron and nickel
Down
  1. 1. surrounds the Earth, extending from its deep interior out into space
  2. 2. The rigid, brittle outer shell comprising the crust and the very top portion of the mantle. It is broken into moving tectonic plates
  3. 4. The rigid lower mantle extending down to the outer core