Q1 Identify at least three ways that volcanic activity shapes the ocean floor.
Q2 What is Subduction? What happens when it occurs?
Q3 Explain the difference between continental shelf, continental slope, and continental rise.
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ANSWER 1.Underwater volcanic activity is a constant process that shapes the features of the ... plate boundaries are submerged, around three-quarters of all volcanic activity on ... When magma reaches the level of the seafloor, it meets cold ocean water and ... This pillow lava, along with slower-cooling magma beneath it, forms the vast .
ANSWER 2.Where two tectonic plates meet at a subduction zone, one bends and slides underneath the other, curving down into the mantle. (The mantle is the hotter layer under the crust.) ... At a subduction zone, the oceanic crust usually sinks into the mantle beneath lighter continental crust.
ANSWER 3.The shelf usually ends at a point of increasing slope (called the shelf break). The sea floor below the break is the continental slope. Below the slope is the continental rise, which finally merges into the deep ocean floor, the abyssal plain. The continental shelf and the slope are part of the continental margin.
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