what shape does the seafloor take where the sediment is the thickest

The core is the thickest layer of the Earth, and the crust is relatively thin, compared to the other layers.

Is the oceanic crust liquid or solid?

The crust is an outer solid layer where life as we know it exists with mountains, sea, and soil. The oceanic crust is made from basalt rock that is thinner than the continental crust, but it is more dense. The mantle is the Earth’s thickest layer.

Why does the old seafloor farthest from the ridge sink beneath the continental crust at the subduction zone?

It is due to the process of subduction; oceanic crust tends to get colder and denser with age as it spreads off the mid-ocean ridges. It gets so dense, that it sinks in the upper mantle (subduction). … As the continental crust is lighter than the oceanic crust, the continental crust cannot subduct.

When sea floor spreading occurs new crust is added to the ocean floor?

Terms in this set (21) What is the process of sea-floor spreading? In sea-floor spreading, the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. As a result, the ocean floors move like conveyor belts, carrying the continents along with them.

Where does subduction occur?

Pacific Ocean
Subduction zones occur all around the edge of the Pacific Ocean, offshore of Washington, Canada, Alaska, Russia, Japan and Indonesia. Called the “Ring of Fire,” these subduction zones are responsible for the world’s biggest earthquakes, the most terrible tsunamis and some of the worst volcanic eruptions.May 6, 2015

Why oceanic crust is heavier than continental crust?

In the theory of tectonic plates, at a convergent boundary between a continental plate and an oceanic plate, the denser plate usually subducts underneath the less dense plate. It is well known that oceanic plates subduct under continental plates, and therefore oceanic plates are more dense than continental plates.

Which is the thicker but less dense crust?

Continental crust is also less dense than oceanic crust, though it is considerably thicker; mostly 35 to 40 km versus the average oceanic thickness of around 7-10 km. About 40% of the Earth’s surface is now underlain by continental crust.

Why are oceanic plates more dense?

Oceanic plates are made of basalt rock, so they are denser. … The oceanic plate is denser and sinks due to its lower buoyancy. It’s sucked into the asthenosphere and is melted deeper into the Earth, called a subduction zone. The continental plate is less dense and floats over the top of it since it is more buoyant.