GEOLOGY

Detailed explanation-1: -Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the Earth’s surface. These are the rocks that form at erupting volcanoes and oozing fissures.

Detailed explanation-2: -The two main categories of igneous rocks are extrusive and intrusive. 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-3: -Igneous rock forms when magma cools and hardens. This can happen either above or below the Earth’s surface, creating two different kinds of igneous rocks-Intrusive and Extrusive.

Detailed explanation-4: -Lava cools to form igneous rocks.

Detailed explanation-5: -Intrusive or extrusive. Intrusive (plutonic) rocks form when magma solidifies within the crust below the surface. It usually cools slowly and produces large crystals. Extrusive (volcanic) rocks form when magma erupts onto the surface of the Earth as lava flows, and usually cools quickly producing small crystals.