Sedimentary rock is comprised of sediment, as the name suggests. Over time, tiny minerals, sand, rocks, and debris layer on top of one another, with the pressure of the layers of ...

Igneous rock is formed by the cooling of molten rock, either at the surface (lava), or underground (as granite or other similar rocks). The heat of molten rock usually incinerates organisms rather ...

Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in four main ways: by the deposition of the weathered remains of other rocks (known ...

For instance, volcanic blasts produce plumes of ash that occasionally bury organisms. Before their bodies are burned away by the torrents of magma, that are spewed onto the surface of the planet, they ...