what are the major structural units of the earth give a brief account
Answers
The crust is the outermost layer of the Earth. It is made of solid rocks. It is mostly made of the lighter elements, silicon, oxygen, aluminium. Because of this, it is known as sial (silicon = Si; aluminium = Al) or felsic.
The mantle is the layer of the Earth right below the crust. It is made mostly of oxygen, silicon and the heavier element magnesium. It is known as sima (Si for silicon + ma for magnesium) or mafic. The mantle itself is divided into layers.
The uppermost part of the mantle is solid, and forms the base of the crust. It is made of the heavy rock peridotite. The continental and oceanic plates include both the crust proper and this uppermost solid layer of the mantle. Together this mass makes up the lithosphere. The lithosphere plates float on the semi-liquid aesthenosphere below.
Upper aesthenosphere: magma
Lower aesthenosphere
Lower mantle
The Earth's core is made of solid iron and nickel, and is at about 5000–6000 °C.
Outer core is a liquid layer below the mantle.
Inner core, is the very center of the Earth.[1]
A full explanation of these effects is not yet clear. It seems that with the increasing heat and pressure comes changes in the crystallization of minerals, so that the composition might be a kind of changing mixture of liquid and crystals.
Answer:
there are three major structural units in earth
crust , mantle , core
Explanation: