GROWTH DEVELOPMENT CHILD
SUMMATIVE ASSESSMENT
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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oceanic thinner and more dense than continental
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continental thinner and more dense than oceanic
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upper mantle thinner and more dense than oceanic
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lower mantle thinner and more dense than oceanic
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Detailed explanation-1: -Oceanic crust is thinner and denser than continental crust. Continental crust is much thicker than oceanic crust. It is 35 kilometers (22 miles) thick on average. All three major rock types-igneous, metamorphic, and sedimentary-are found in the crust.
Detailed explanation-2: -Oceanic crust is generally composed of dark-colored rocks called basalt and gabbro. It is thinner and denser than continental crust, which is made of light-colored rocks called andesite and granite. The low density of continental crust causes it to “float” high atop the viscous mantle, forming dry land.
Detailed explanation-3: -Oceanic crust is thinner and denser than continental crust.
Detailed explanation-4: -Layers that are less dense, such as the crust, float on layers that are denser, such as the mantle. Both oceanic crust and continental crust are less dense than the mantle, but oceanic crust is denser than continental crust. This is partly why the continents are at a higher elevation than the ocean floor.
Detailed explanation-5: -Oceanic crust is thinner, but denser than continental crust. Continental crust is thicker, but less dense. So when the two collide, the heavier, oceanic crust subducts below the continental crust.