The process of formation of igneous rocks begins inside the Earth. Where is the <u>hot liquid magma</u>. When this magma cools it is when igneous rocks are generated.
Two situations can occur: that the <u>magma is slowly cooling inside the Earth</u>, where it will solidify and create <u>intrusive rocks.</u> Or it may happen that hot magma comes out through a volcanic eruption, where it is directed towards the surface through the ducts that are part of a volcano, and <u>once it meets the cold air on the Earth's surface , solidifies and creates volcanic or extrusive rocks,</u> which have very valuable minerals and crystals.
This type of rock is what makes up 95% of the earth's surface.
Oil and natural gas are found beneath the North Sea floor. Norway, the Netherlands, the United Kingdom, and Denmark pump oil from rigs as far as 400 miles out in the ocean.
