The crust is the outermost layer of the earth.
Mantle is a layer between the crust and the outer core.
Outer core of the Earth is a fluid layer about 2,300 km (1,400 mi) thick and composed of mostly iron and nickel that lies above Earth's solid inner core and below its mantle.
The Earth's inner core is the Earth's innermost part and according to seismological studies, it has been believed to be primarily a solid ball with a radius of about 1,220 kilometers (760 miles), which is about 70% of the Moon's radius.
The continental crust is the layer of granitic, sedimentary and metamorphic rocks which form the continents and the areas of shallow seabed close to their shores, known as continental shelves.
Oceanic crust is about 6 km (4 miles) thick. It is composed of several layers, not including the overlying sediment.
Earth's lithosphere includes the crust and the uppermost mantle, which constitute the hard and rigid outer layer of the Earth.
The asthenosphere is the highly viscous, mechanically weak and ductilely deforming region of the upper mantle of the Earth. As showed above.
Convection currents in the magma drive plate tectonics. Heat generated from the radioactive decay of elements deep in the interior of the Earth creates magma (molten rock) in the aesthenosphere. The aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the Earth that extends to 2900 km.
Polar ice caps are dome-shaped sheets of ice found near the North and South Poles. They form because high-latitude polar regions receive less heat from the Sun than other areas on Earth. As a result, average temperatures at the poles can be very cold.