Rocks of the Earth

A Rock is a natural substance composed of solid crystals of different mineral materials fused to form a solid lump. These materials may not have been formed at the same time, however, through natural processes over time these minerals have been "glued" together.

Rocks differ in size, texture, colour, permeabilityPermeability is a measure of the ability of a porous material (having small spaces or holes through which liquid or air may pass) to allow fluids to pass through it. More, structure, manner of development and ability ...