Which layer of the Earth is the most dense?
the lower mantle
the upper mantle
What two kinds of crust are there?
lithospheric and asthenospheric
silicon-based and iron-based
continental and oceanic
outer and inner
The ancient supercontinent, Pangaea, once contained all of the Earth’
Which of the following are produced by a destructive process?
deep sea trenches
Volcanoes typically occur at the