How Rocks Form

1
How Rocks Form
- Classifying Rocks

• Geologists classify rocks into three major
  groups igneous rock, sedimentary rock, and
  metamorphic rock.

2
Classifying Igneous Rocks
- Igneous Rocks

• Igneous rocks are classified according to their
  origin, texture, and mineral composition.

3
From Sediment to Rock
- Sedimentary Rocks

• Most sedimentary rocks are formed through a
  series of processes erosion, deposition,
  compaction, and cementation.

4
A Cycle of Many Pathways
- The Rock Cycle

• Forces deep inside Earth and at the surface
  produce a slow cycle that builds, destroys, and
  changes the rocks in the crust.