EARTH SCIENCE
TECTONICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The location at the deepest part of the sea where old layers of rock are destroyed.
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The place where marine life congregates before it migrates to other areas.
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A series of human-made rock formations that delineate continental boundaries.
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An underwater mountain range formed by the movement of tectonic plates.
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Detailed explanation-1: -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-2: -A seamount is an underwater sea mountain formed by plate tectonics and volcanic activity. Seamounts form near the boundaries of tectonic plates and hotspots (Image 1).
Detailed explanation-3: -A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics. It typically has a depth of about 2, 600 meters (8, 500 ft) and rises about 2, 000 meters (6, 600 ft) above the deepest portion of an ocean basin. This feature is where seafloor spreading takes place along a divergent plate boundary.
Detailed explanation-4: -As tectonic plates slowly move away from each other, heat from the mantle’s convection currents makes the crust more plastic and less dense. The less-dense material rises, often forming a mountain or elevated area of the seafloor. Eventually, the crust cracks.
Detailed explanation-5: -Seafloor Spreading at Mid-Ocean Ridges. Convection currents drive the movement of Earth’s rigid tectonic plates in the planet’s fluid molten mantle. In places where convection currents rise up towards the crust’s surface, tectonic plates move away from each other in a process known as seafloor spreading (Fig. 7.21).