Ms. Wallauer is a geologist with the United States Geological Survey. She is studying the picture below and sees that it represents the effect of tension on the earth’s crust. Faults and rift valleys are the results of movement in the crust. What type of force would she determine causes these movements in the plates? *

Balanced forces
Unbalanced forces
Inertia
Friction

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle

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