Week 4 Test Answers

Which of the following best explains why deforestation increases the risk of floods in an area?a.Tree leaves catch and retain rain water.b.Trees block the free flow of water.c.Deforestation increases precipitation.d.Tree roots improve soil water retention.

Hurricanes are more destructive than tornados due to _______.a.coastal storm surgesb.their shorter durationc.the combination of high winds and flood watersd.all of the above

Which of the following best explains the importance of Earth’s crust to living organisms?a.The continental crust allowed the evolution of life on land.b.The crust provides raw materials necessary for life.c.The crust allowed the formation of fossil fuels.d.The rock cycle recycles sedimentary rocks formed from animal shells.

Ocean ridges form as a result of _______.a.slab pullb.the upwelling of magma from the asthenospherec.sediment being deposited from the oceand.all of the above

The boundary where crust gives way to mantle is called the _______.a.asthenosphereb.mesospherec.Mohorovicic discontinuityd.Vernian divide

The mixture of water and rubble that flows from the slope of a volcano is a _______.a.pyroclastic flowb.fumarolesc.tephrad.lahar

The continental crust covers _______ of the Earth’s surface.a.40%b.50%c.60%d.70%

According to the theory of plate tectonics, which is one feature that plates carry?

Study this image.

Which features form along all types of plate boundaries?

Study this image of lithospheric plates.

Explain how oceanic crust is continuously created at mid-ocean ridges.

The core of the Earth is mostly composed of _______.a.magnesium and siliconb.aluminum and siliconc.nickel and irond.aluminum and iron

Which of the following best describes the compositional layers of the earth?a.All layers of the Earth below the crust are liquid.b.The only liquid layer of the earth is the mantle.c.The crust floats on top of the outer core.d.Some layers of the earth are liquid, and some are solid.

Tsunamis are the result of _______.a.undersea volcanic eruptionsb.undersea earthquakesc.hurricanesd.all of the above