Types of Rock

Types of Rocks

The three types of of rock

IGNEOUS ROCKS - Igneous rocks are formed from the

cooling and solidification of magma or lava.

Example of igneous rocks include

granite, basalt, and obsidian.

SEDIMENTARY ROCKS - Sedimentary rocks are formed from the accumulation and compaction of sediments over time.

Examples of sedimentary rocks

include limestone, sandstone, and

shale.

The process to form sedimentary rocks

1. Weathering

● Rocks are broken down into smaller pieces (sediments) by wind, water, ice, or chemical

processes.

2. Erosion

● The sediments are transported away from their original location by wind, water, or ice.

3. Deposition

● The sediments settle and accumulate in layers, usually in bodies of water like rivers, lakes, or

oceans.

4. Compaction

● Over time, more layers build up, and the weight compresses the sediments below.

5. Cementation

● Minerals in water seep through the layers and "glue" the sediments together, forming solid rock.

METAMORPHIC ROCKS - are formed from the alteration of pre-existing rocks

due to heat, pressure, and chemical processes.

Examples of metamorphic rocks

include marble, slate, and schist.