The Earth's Interior

Our planet consists of many treasures hidden in its fold, we need to explore. Much of the information existing on the Earth's interior comes from studies of how seismic waves travel through the Earth, and laboratory tests on the surface of minerals and rocks at high pressure and temperature. Other important information comes from geological observations and the flow of heat from the earth.

outermost surface of the earth's crust is called the crust. L 'Crust is generally thick, about 25 miles thick beneath the continents and about 6.5 km beneath the oceans. The crust is relatively light and fragile. The thickness and composition of the Earth are different for land and sea. Most earthquakes occur within the crust. The crust in this image is much smaller than in the real world!

Earthquake & Tsunami In Japan

The mantle extends to a depth of 2890 km, making it the thickest layer of earth. The pressure at the bottom of the mantle, is 140 GPa. The sheath is made up ofsilicates, which are relatively rich in iron and magnesium in the overlying crust. Although solid, due to high temperatures in the mantle of silicate material sufficiently ductile. Going from the mantle to the core, there is a significant decline (30 percent) in the speed of seismic waves and a significant increase (30 percent) in density. The core is the innermost layer of the earth. And 'the outer core and inner core together. The outer core is liquid, because it assumes thatdoes not transmit shear (S) waves, and because the rate of compression (P) waves passing through them is greatly reduced. The inner core is crossed, as the behavior of sound waves P and S. Well, it's above description of the main layers of our Mother Earth. It 'important to know about them to arrive at an understanding of the earth in better shape. The Earth's Interior