Types of Rocks

Sedimentary Rocks

• Formed when sediments accumulate and compact and cement together.

• Often deposited in layers and contain sand, pebbles, and frequently fossils.

• Examples: sandstone and limestone

• Sand, pebble, and even boulder size particles.

• Some may contain fossils.

How are Sediments Moved?

• Deposition - They are deposited in layers

• Erosion

• Wind

• Water

• Gravity

• Ice

Metamorphic Rocks

• Formed by heat and pressure while buried deep below Earth's surface.

• Have a layered or banded (ribbon-like) appearance or may have crystals.

• Examples: gneiss, marble and slate.

• Layers look like ribbons.

• Crystals

Igneous Rocks

• Formed when lava or magma harden.

• Found near volcanoes or fissures.

• Examples: basalt, obsidian, and granite.

Igneous Properties

• fast and slow cooling

• glassy

• large crystals

• Holes where gas was trapped

• Many colors