Rock Types: Igneous, Sedimentary, and Metamorphic Rocks Explained. Posted: March 12, 2025 | Last updated: March 12, 2025. This 1930s educational film explores the natural landscapes, geological ...

Characteristics of igneous rocks. These rocks are formed when magma solidifies. As the magma cools, mineral crystals will begin to grow. These crystals will grow and interlock to form a hard ...