GENERAL GEOLOGY

Detailed explanation-1: -Processes driven by heat from the Earth’s interior are responsible for forming both igneous rock and metamorphic rock. Weathering and the movement of weathered materials are external processes powered by energy from the sun.

Detailed explanation-2: -Internal energy drives plate tectonics and produces magmas that cool to form igneous rocks. These rocks can be subducted back into the mantle later or metamorphosed during tectonic activity. All rocks can be weathered and eroded by the externally-driven hydrologic cycle.

Detailed explanation-3: -Extrusive (or volcanic) igneous rock is produced when magma rises and cools at or near the Earth’s surface, such as erupting volcanoes and oozing fissures.

Detailed explanation-4: -Extreme pressure from burial, increasing temperature at depth, and a lot of time, can alter any rock type to form a metamorphic rock. If the newly formed metamorphic rock continues to heat, it can eventually melt and become molten (magma). When the molten rock cools it forms an igneous rock.