The Rock Cycle

METAMORPHICRock that was once one form of rock but has changed to another under the influence of heat and pressure.

SEDIMENTARYRock that has formed through the deposition and solidification of sediment, especially sediment transported by water (rivers, lakes, and oceans), ice (glaciers), and wind. Sedimentary rocks are often deposited in layers, and frequently contain fossils.

IGNEOUSRocks formed by the cooling and solidifying of molten materials. Igneous rocks can form beneath the Earth's surface, or at its surface, as lava.

The Rock Cycle and the Three Types of RocksVeda Dayananda

The Moh's hardness scale is a scale that shows the hardness of different rocks.

The Three Types of Rocks