GENERAL KNOWLEDGE

Detailed explanation-1: -When lava reaches the surface of the Earth through volcanoes or through great fissures the rocks that are formed from the lava cooling and hardening are called extrusive igneous rocks. Some of the more common types of extrusive igneous rocks are lava rocks, cinders, pumice, obsidian, and volcanic ash and dust.

Detailed explanation-2: -Magma makes its way out of the volcano and onto the earth’s surface in the form of lava. This lava solidifies over a period of time and forms igneous rocks.

Detailed explanation-3: -Extrusive rocks are formed on the surface of the Earth from lava, which is magma that has emerged from underground. Intrusive rocks are formed from magma that cools and solidifies within the crust of the planet.

Detailed explanation-4: -Basalt, tuff, pumice are examples of extrusive igneous rock.