lithosphere

The special feature of the upper mantle is the asthenosphere layer. Explanation: It is the chemical composition, which is quite similar to the crust. One of the difference is which the rocks and minerals of mantle has tend to have more amount of magnesium and less amount of “silicon and aluminum” than the crust.

Explanation:he crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks. The crust is underlain by the mantle. The upper part of the mantle is composed mostly of peridotite, a rock denser than rocks common in the overlying crust.

According to Wikipedia, one of the unique traits of the upper mantle is its movement. Due to the temperature differences between the surface of the Earth and outer core the upper mantle has the ability to flow like a fluid. It has a soft and weak layer called the asthenosphere which is capable of flowing.

Together with the crust, we call it the lithosphere. Below the lithosphere is a layer of upper mantle called the asthenosphere. This is made up rock that is fluid and can move. It is this fluidity that powers the movement of the tectonic plates of the Earth’s crust.

Answer: As the mantle rocks melt they form magma. Because the magma is less dense than the surrounding mantle material it will rise.

Flux melting occurs when water or carbon dioxide are added to rock. These compounds cause the rock to melt at lower temperatures. This creates magma in places where it originally maintained a solid structure.

Answer. Explanation: Sea-floor spreading is what happens at the mid-oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor.

The ocean floor is called the abyssal plain. Below the ocean floor, there are a few small deeper areas called ocean trenches. Features rising up from the ocean floor includeseamounts, volcanic islands and the mid-oceanic ridges and rises. bolivianouft and 2 more users found this answer helpful. Thanks 1.