* Activity groups: 4 groups (4 minutes)
+ Group 1-2: Earth's crust and how structures are characterized by what?
As a solid rock, formed by the array address. Thick crust from 5 to 70 km, this very thin layer made up 15% by volume and 1% of Earth's volume.
+ Group 3-4: Crust How has the role of life and production activities of human? Why?
There is a very important role because it is where the existence of the natural ingredients and is inhabited, the activities of human society.
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