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Old ocean floor is destroyed and absorbed by the Earth and remelted beneath what?
Old ocean floor is destroyed and absorbed by the Earth at subduction zones, where tectonic plates collide and one plate is forced beneath the other. The remelting occurs beneath volcanic arcs, where the subducted crust melts and rises to the surface as magma, leading to the formation of new crust.
Why are the oldest parts of the ocean floor no older than about 200 million years.?
Because the oldest parts reach the continental crust and then the ocean floor sinks beneath the continental crust, into the mantle.
If volcanoes get their magma from the crust below them what can you say about the silica content of Earths crust under the oceans?
The silica content of the Earth's crust beneath the oceans is typically lower compared to the crust beneath continents. This lower silica content results in a type of magma known as basalt, which is commonly associated with oceanic volcanoes like those found along mid-ocean ridges.
What two regions of the earth does the Moho discontinuity separate?
The Mohorovičić discontinuity (Moho) separates the Earth's crust from the underlying mantle. It is found beneath continents and beneath ocean basins.
What is the process of the ocean floor that sinks beneath a deep-ocean trench and back into the mantle known as?
The process of the ocean floor sinking beneath a deep-ocean trench and returning to the mantle is known as subduction. This occurs when one tectonic plate moves under another and is forced into the mantle due to gravitational forces. Subduction is a key component of the Earth's tectonic cycle and contributes to geological phenomena such as earthquakes and volcanic activity.
Why is the ocean floor beneath Hawaii sinking?
The ocean floor beneath Hawaii is sinking due to the weight of the volcanic islands and seamounts causing the underlying crust to gradually bend and subside. This process is known as flexural subsidence and is a common feature of volcanic island chains.
What is a valuable substance beneath the ocean floor?
A valuable substance beneath the ocean floor often includes gold, crystal and many other substances. Where these are found varies.
What caused the tsunami to happen?
An earthquake beneath the Ocean floor.
What are triggered by earthquakes originating beneath the ocean floor?
Focus
Are triggered by earthquakes originating beneath the ocean floor?
Tidal waves ?
What happens to the ocean floor at the deep ocean trenches?
what happens is the ocean floor does not just keep spreading.instead, it sinks beneath deep underwater canyons called deep- ocean trenches
What is tsuname?
A giant wave usually caused by an earthquake beneath the ocean floor
What causes the hot materials beneath ocean floor to move?
Convection currents.
Portion of the earth's crust that lies beneath the ocean floor?
The portion of Earth's crust that lies beneath the ocean floor is called oceanic crust. It is thinner and denser than continental crust, primarily composed of basaltic rocks, and formed at mid-ocean ridges through volcanic activity.
Is it true that tsunami are triggered by earthquakes originating deep beneath the ocean floor?
True
What is an ocean thermal vent?
It is a place where volcanism or hot water heated by the underlying magma erupts on the ocean floor.
Old ocean floor is destroyed and absorbed by the Earth and remelted beneath what?
Old ocean floor is destroyed and absorbed by the Earth at subduction zones, where tectonic plates collide and one plate is forced beneath the other. The remelting occurs beneath volcanic arcs, where the subducted crust melts and rises to the surface as magma, leading to the formation of new crust.
