Question

Why is the earth interior in most part found in a solid state despite greatheat and pressure?

Answer 1

Its the pressure that makes the inner core solid, despite the heat. It has been suggested that the inner core is a giant solid crystal of iron (Anisotropy of Earth's Inner Core). The outer core, making up 15% of the Earth’s volume and perhaps 30% of its mass, is liquid. This is known because it will not transmit shear waves.

The Earth’s mantle - making up 83% of the Earth’s volume - does transmit shear waves, so it can be considered solid. However it is also slowly in the process of convection. Heat from the core causes the hotter rocks to slowly rise in giant convection cells. In this sense the mantle can be considered as a very viscous liquid.

It is the convection in the mantle that drives plate tectonics, the slow movement of the continents. The areas on the surface above the slowly streams of rock are where we find volcanoes. As material rises towards the surface, the pressure drops - which drops their melting point, which is why lava flows out as a liquid.

Answer 2

Answer:

beacauee the temperature is high in core