EARTH SCIENCE
TECTONICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Mid-ocean ridges push new seafloor to the plate boundary trenches
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Volcanic eruptions make new seafloor and force old seafloor into magma
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Folding of crust creates room for new magma to cool
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Plate boundary trenches pull old crust into slip-strike faults
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Detailed explanation-1: -Seafloor spreading and other tectonic activity processes are the result of mantle convection. Mantle convection is the slow, churning motion of Earth’s mantle. Convection currents carry heat from the lower mantle and core to the lithosphere .
Detailed explanation-2: -Mid-ocean ridges occur along divergent plate boundaries, where new ocean floor is created as the Earth’s tectonic plates spread apart. As the plates separate, molten rock rises to the seafloor, producing enormous volcanic eruptions of basalt.
Detailed explanation-3: -Seafloor spreading is a geologic process in which tectonic plates large slabs of Earth’s lithosphere split apart from each other. Seafloor spreading occurs along mid-ocean ridges (large mountain ranges rising from the ocean floor). The Mid-Atlantic Ridge is formed in the Atlantic ocean because of seafloor spreading.
Detailed explanation-4: -Magma comes out of the rift valley. Magma cools to rock and hardens. Rock is pushed away as new rock is formed at MOR. Oceanic crust and continental crust meet at the trench. Oceanic crust bends down under the continental crust. Gravity pulls rock towards mantle. Rock melts to mantle.