5:11 PM 84% Tectonics and the Origin of Magma the Earth Works: Examining Plate T

Question

5:11 PM 84% Tectonics and the Origin of Magma the Earth Works: Examining Plate Tectonics st is: 8 What causes the tectonic plates to move? A. Ocean currents B.Volcanoes C. The Coriolis effect D. Convection in the mantle earthquakes 9.The mid-ocean ridge occurs along a: A. Convergent boundary where new crust is formed B. Transform boundary where crust is subducted C. Divergent boundary where sea-floor spreading takes place D. Divergent boundary where subduction takes place opposite 10. When two continental plates pull apart a forms. A. Subduction zone B. Mountain range C. Earthquake D. Rift valley than 11. Oceanic crust is continental crust. alled a A. Less dense B. More dense than 12. Continental crust is oceanic crust. rt is called a: A. Thicker B. Thinner 13. A place where an unusually hot part of the mantle rises through the crust causing volcanic activity is called a A. Divergent boundary B Hot spot C Convergent boundany D. Transform boundary m boundary 14. The fact that ice floats on top of water is like the fact that A. The mantle causes earthquakes and volcanoes B. The mantle is colder than the crust C. The less dense crust sits on top of the mantle D. The crust is melting f the

Explanation / Answer

Answer 8) Option D- Convection in mantle

Explanation-Convection of magma in the mantle is the driving force for plate movement.

Answer 9) Option C- At Divergent boundary where sea floor spreading takes place.

Explanation-Mid Oceanic ridges are known as spreading centres in the oceanic crust. They are responsible for formation of new oceanic lithosphere from the molten magma coming out from the ridges.

Answer 10)Option D-Rift valley.

Explanation-A Rift valley is a characteristic feature in a pull apart basin

Answer 11) Option B-More dense

Explanation-Density of continental crust is 2.7g/cc and oceanic crust is 3.0g/cc

Answer 12) Option B- Thicker that

Explanation-Continental crust has thickness of 7-10 km.Oceanic crust thickness is 6km

Answer 13) Option B- Hotspot

Explanation-A hotspot has an unusually higher temperature than the surroundings, where the source is deep mantle in form of plume

Answer 14) Option C-Thevless dense crust sits on top of the mantle

Explanation- The density of mantle is 3.4-4.4g/cc, whereas the crust density is 2.2g/cc.

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