General Science Questions

The thinnest layer is crust. It is about 100km. Where as mantle ranges upto 2900 km and the inner most core ranges upto 6300km.

Crystal size in igneous rocks is determined by rate of cooling i.e, the time taken by magma to cool down. 

Hence, the slower the rate of cooling the larger the crystals. The faster the rate of cooling the smaller the crystals.

The Plant Fibres are made up of cellulose whereas animal fibres are made up of collagen.

From the cornea, the light passes through the pupil. From there, it then hits the lens, the transparent structure inside the eye that focuses light rays onto the retina. The iris, or the colored part of your eye, regulates the amount of light passing through. 

A geology is a branch of science that deals with the study of Earth, its structure and materials made it. And the person who studies this is called as Geologist.

In communication satellite, multiple repeaters are known as Transponders.