1. What are the different rock types?
Rocks
Igneous
A mixture of one or more minerals and organic matter
Three types of rocks
Igneous
Sedimentary
Metamorphic
Form when magma cools
Found near volcanoes or at oceanic divergent zone
Texture is determined by how fast the magma cools
Magma that cools quickly forms smooth grained rocks (smooth to touch)
Magma that cools slowly forms course grained rocks (rough to touch)

2. Igneous Rock Formations
Intrusive Igneous rocks form below the earth’s surface or inside the Earth
Have course grained texture
Extrusive Igneous rocks form on the Earth’s surface
Have a smooth texture because the magma cools quickly

3. Sedimentary Rocks
Formed from sediments made during the erosion of other rocks
Sediments settle in low places, usually near or under bodies of water
Over time the sediments form layers that are compacted together and form rocks
Sedimentary rocks are almost always found in strata or layers

4. Contact metamorphism occurs when rocks are heated by nearby magma
Metamorphic Rocks
Form deep in the Earth where heat and pressure change rocks into new and different types of rocks
The atoms in the minerals are actually rearranged and turned into new minerals which make new rocks
Contact metamorphism occurs when rocks are heated by nearby magma
The heat causes the minerals in the rocks to change
Regional metamorphism occurs deep in the earth where pressures build up and are able to create a chemical change in the rocks