Geography

Rocks

Rocks


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Rock is a natural aggregate formed by one or more minerals. They are classified according to their origin.

Magmatic or igneous rocks

They are ancient (primary) rocks, formed by the cooling of magma (material existing inside the globe) as they move towards the surface. Magmatic rocks, depending on where they cooled down, can be classified into two groups:
The) Plutonic or intrusive rocks: when magma consolidation occurs inside the earth.


Diorite is a type of plutonic or intrusive rock

B) Effusive or extrusive rocks: when magma consolidation occurs on the outside of the earth. They are also called volcanic. Example: basalt.


Basalt is a type of effusive or extrusive rock.

Sedimentary rocks

They are formed by fragments of other rocks accumulated in various points of the crust, as well as by chemical and organic processes. Examples: clay, sand, gravel, rock salt, coal.


Rock salt is an example of sedimentary rocks

Metamorphic Rocks

They are formed from the modifications suffered by the magmatic and sedimentary rocks. These changes happen when rocks are subjected to heat and pressure from the interior of the earth. The transformed rock acquires new characteristics and has its composition altered. In this process, sediments accumulate and consolidate in layers or strata.

To better understand rocks:

Classification

Division

Examples

Magmatic

Intrusive or plutonic

Extrusive or volcanic

Granite

Basalt

Sedimentary

Dendritic

Chemical origin

Organic origin

Sand

Stalactite

Limestone

Metamorphic

Marble

Next we will study the igneous or magmatic rocks a little more.