Metamorphic rock is formed when existing rock is transformed under high ... or “weathered,” the sediment is moved by forces such as water and wind and deposited elsewhere in layers. Over time, these ...

Geologists have long struggled to understand massive time gaps in Earth’s rock record, where millions—sometimes billions—of ...

The layer was subsequently covered. Around 1.7 billion years ago, by then deep underground, the layer was transformed into schist (a hard metamorphic rock) through heat and pressure.

Over time, the layers are compressed and glued together.Metamorphic rocks are formed from other rocks, igneous or sedimentary, which are heated and compressed underground.Igneous rocks are formed ...

including layers, crystal structures, and the processes of crystallization. The film explains the differences between volcanic rocks, plutonic rocks, and metamorphic rocks, emphasizing the role of ...