User:RhoysDeon

formation of magma


==== Deep beneath the earth's crust, there are hard rocks that as a result of intensive heat are melted into a liquid form called lava. This reaction then mounts pressure on the crust. As a result of compressional and tensional forces occurring within the crust, cracks are formed on the surface of the earth that reaches deep into the crust. Pressure is then released on the lava also known as magma which causes an explosion, hence, volcanic eruption. ====

Types of volcanoes
Shield volcano; this is a type of volcano that is formed from basic lava with less viscosity, which erupts slowly and spreads gently from side to side giving gentle slopes. Mauna Lua and Mauna Kea in Hawaii are examples of shield volcanoes

stratovolcano; this type of volcanoes formed from the eruption of highly viscous lava that explodes, giving a more conical shape with steep slopes. Other types of volcanoes may be ash and cinder cones, etc..... examples of stratovolcanoes are the Krakatoa in Indonesia and the Vesuvius in Italy.

NB ; when magma cools and solidifies underneath the earth's crust, it's called an intrusive volcano, whereas extrusive volcanoes cool and solidify on the earth's surface.