"Molten rock" refers to melted or liquid rock, typically heated to very high temperatures. It is often associated with volcanic activity and when it cools down, it solidifies to form igneous rocks like granite or basalt. Full definition
The billion - year cycle of molten rock rising from the core - mantle boundary and falling from the crust — not unlike the motion of globules in a lava lamp — takes form, as do other geologic features of interest. (sciencedaily.com)
New data reveal an unprecedented depiction of a region of partially molten rock deep within the Earth, which appears to be feeding material in the form of a plume to the surface, where Iceland is located. (sciencedaily.com)
PAHOA, Hawaii — White plumes of acid and extremely fine shards of glass billowed into the sky over Hawaii as molten rock from Kilauea volcano poured into the ocean, creating yet another hazard from an eruption that began more than two weeks ago. (tampabay.com)