Earth Quake Engineering, And its type Core Mantle crust, and its type three main layer Earth quack engineering DAE civil B.Tech BSc

Earth Quake Engineering, And its type Core Mantle crust, and its type three main layer Earth quack engineering DAE civil B.Tech BSc
Earth Quake Engineering 

The Earth is made up of 3 main layers:•Core
• •Mantle
• •Crust             
Crust:•Earth's crust is made up of several elements: oxygen, 46.6 percent by weight; silicon, 27.7 percent; aluminum, 8.1 percent; iron, 5 percent; calcium, 3.6 percent; sodium, 2.8 percent, potassium, 2.6 percent, and magnesium, 2.1 percent.••Plate tectonics is the theory explaining the motion of these plates.                          


•Mantle•The mantle under the crust is about 1,800 miles deep (2,890 km). It is composed mostly of silicate rocks rich in magnesium and iron. Intense heat causes the rocks to rise. They then cool and sink back down to the core. This convection — with the consistency of caramel — is thought to be what causes the tectonic plates to move. When the mantle pushes through the crust, volcanoes erupt.•Core•At the center of the Earth is the core, which has two parts. The solid, inner core of iron has a radius of about 760 miles (about 1,220 km), according to NASA. It is surrounded by a liquid, outer core composed of a nickel-iron alloy. The outer core is about 1,355 miles (2,180 km) thick. The inner core spins at a different speed than the rest of the planet. This is thought to cause Earth's magnetic field•                                        Crust 
•The Crust•This is where we live!•• The Earth’s crust is made of:•