Rocks

Rocks

The geological processes operating on Earth can be divided into two large groups: endogenous processes - taking place in the depths of the earth's crust and exogenous processes - taking place on its surface. Rock-forming processes belong to both of these groups. Rocks are formed both by the solidification of the lava, which emerges through the craters of volcanoes from the depths of the earth's crust, and as a result of the deposition in water reservoirs of material deposited by rivers resulting from the weathering of previously existing rocks. The rock is generally classified into three groups based on how it is formed: igneous, sedimentary and transformed, that is, metamorphic.