Question

what is rock define the definition

Answer 1

Rock or stone is a natural substance, a solid aggregate of one or more minerals or mineraloids. For example, granite, a common rock, is a combination of the minerals quartz, feldspar and biotite. The Earth's outer solid layer, the lithosphere, is made of rock.

Rock has been used by humankind throughout history. The minerals and metals in rocks have been essential to human civilization.

Three major groups of rocks are defined: igneous, sedimentary, and metamorphic. The scientific study of rocks is called petrology, which is an essential component of geology.

Answer 2

                                  Rocks

A rock is a piece of earth mostly made up of a mixture of minerals. They can be found in different shapes, sizes, colors.

Definition : A natural material which is hard or soft and having a distinctive mineral composition is called rock.

                                       

                                         

                        Types of Rocks

There are three types of rocks which are listed below :-

• Igneous Rocks

       These rocks are formed by the cooling and solidification of a molten , material called 'magma'. The word igneous mean 'coming out of fire' that is granite and gabbro etc. Aluminium is a major component of many igneous minerals including mica and clays.

• Sedimentary Rocks

       These rocks are formed when layers of rock pieces and eroded soil get squeezed and cemented together to form a solid rock that is sandstone, gravels etc.

• Metamorphic Rocks

       Due to pressure and heat, igneous as well as sedimentary rocks undergo changes in their appearance, properties and characters and the rocks which are formed by this process are called metamorphic rocks that is marble, slate etc.