GEOLOGY

Detailed explanation-1: -When magma is ejected by a volcano or other vent, the material is called lava. Magma that has cooled into a solid is called igneous rock.

Detailed explanation-2: -When magma reaches the surface it is then called lava and the eruptions of lava and ash produce volcanoes. The lava that reaches the Earth’s surface will harden and become igneous rock.

Detailed explanation-3: -Lava is a liquid, that cools into rock, which is a solid. BACKGROUND: Lava is molten rock (a liquid) that flows on the earth’s surface. Lava is formed inside the crust of the Earth by extreme heat; it erupts to form a volcano.

Detailed explanation-4: -Extrusive igneous rocks form when lava erupts and cools at the surface.

Detailed explanation-5: -Lava is most fluid when first erupted, becoming much more viscous as its temperature drops. Lava flows quickly develop an insulating crust of solid rock as a result of radiative loss of heat. Thereafter the lava cools by very slow conduction of heat through the rocky crust.