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What is an area on Earth where the lithospheric plates are moving away from each other forming an extensive system of fractures and faults is responsible for sea floor spreading?

The answer is Divergent boundary. Explanation: It is an are where two lithospheric plates move away from each other which results in cracks and faults.

Which of these factors causes the lithospheric plate to split and move far away?

The heat from radioactive processes within the planet’s interior causes the plates to move, sometimes toward and sometimes away from each other. This movement is called plate motion, or tectonic shift.

Where are the moving plates of the Earth located?

The theory of plate tectonics states that the Earth’s solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the planet.

What are lithospheric plates?

A tectonic plate (also called lithospheric plate) is a massive, irregularly shaped slab of solid rock, generally composed of both continental and oceanic lithosphere. Plate size can vary greatly, from a few hundred to thousands of kilometers across; the Pacific and Antarctic Plates are among the largest.

What are the 2 types of crustal plates?

There are two main types of tectonic plates: oceanic and continental. Oceanic – Oceanic plates consist of an oceanic crust called “sima”.

What is the largest major plate?

Pacific Plate

What is the difference between the crust and a plate?

The surface of the Earth is broken up into large plates. It’s easy to confuse these plates with the Earth’s crust – the thin outermost layer of the Earth. When we talk about tectonic or lithospheric plates, we mean the sections into which the lithosphere is cracked.

What is the force that drives plate tectonics?

Recent research has shown that the major driving force for most plate movement is slab pull, because the plates with more of their edges being subducted are the faster-moving ones. However, ridge push is also presented in recent research to be a force that drives the movement of plates.

Is lithosphere the crust?

The lithosphere is the solid, outer part of the Earth. The lithosphere includes the brittle upper portion of the mantle and the crust, the outermost layers of Earth’s structure.

Is the asthenosphere solid or liquid?

The asthenosphere is a solid but it can flow, like toothpaste. The lithosphere rests on the asthenosphere.

What is an interesting fact about the asthenosphere?

The rock in the asthenosphere is low density and partially molten. Underneath the oceans the asthenosphere is closer to the earth’s surface. When crustal plates sink into the earth’s mantle deep zone earthquakes can occur in the asthenosphere.

What is another name for asthenosphere?

The asthenosphere (Ancient Greek: ἀσθενός [asthenos] meaning “without strength”, and thus “weak”, and σφαίρα [sphaira] meaning “sphere”) is the highly viscous, mechanically weak, and ductile region of the upper mantle of Earth.

Why is the mantle divided into 2 layers?

Explanation: The difference between these two layers of the mantle comes from the predominant mineral phases in the rock. Both the upper and lower mantle consist primarily of silicate minerals. Asthenosphere: Most of the upper mantle is hot enough, above 1300°C, for its rock to undergo plastic flow.

What is the lower layer of the mantle?

Below the Moho, the mantle is characterized by peridotite, a rock mostly made up of the minerals olivine and pyroxene. The asthenosphere is the denser, weaker layer beneath the lithospheric mantle. It lies between about 100 kilometers (62 miles) and 410 kilometers (255 miles) beneath Earth’s surface.

What is the main difference or differences between the crust and the mantle?

The crust is made of solid rocks and minerals. Beneath the crust is the mantle, which is also mostly solid rocks and minerals, but punctuated by malleable areas of semi-solid magma.

Which is thicker the lithosphere or the crust?

Oceanic lithosphere is typically about 50-100 km thick (but beneath the mid-ocean ridges is no thicker than the crust). The continental lithosphere is thicker (about 150 km). The oceanic lithosphere thickens as it ages and moves away from the mid-ocean ridge.

Is the mantle thinner than the crust?

Our planet’s crust is on average about 40 km deep – which is much thinner than the mantle, the outer core and the inner core – you can think of it like the peel of an apple. The crust here has been generated through igneous processes, which explains why the crust has much more incompatible elements than the mantle.

Is the crust the thinnest layer?

* The Earth’s crust is the outermost surface. *It is a very thin layer of solid rock. It is the thinnest layer of the Earth. *The crust is 5-35km thick beneath the land and 1-8km thick beneath the oceans.

Where is crust the thinnest?

The crust is made up of the continents and the ocean floor. The crust is thickest under high mountains and thinnest beneath the ocean.

Where is oceanic crust the thinnest?

PROVIDENCE, R.I. — Scientists say they have discovered the thinnest portion of the Earth’s crust — a 1-mile thick, earthquake-prone spot under theAtlantic Ocean where the American and African continents connect.

Which crust is thicker but with less density?

Oceanic crust