Earth's systems vocabulary

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Across
  1. 3. spreading__ occurs when divergent plates separate. convection currents cause less dense material to rise. creates new ocean floor
  2. 5. boundary____ boundary where tectonic plates divide
  3. 6. solid, outermost layer of the earth, lying above the mantle
Down
  1. 1. boundary____ boundary where tectonic plates collide
  2. 2. layer that lies between the earth's crust and core. The majority of the earth's mass is in this layer.
  3. 4. innermost layer of earth. divided into 2 parts, liquid outer and solid inner. mad of iron and nickel
  4. 7. boundary____ boundary where plates slide past each other