- Plates separate or collide and magma rises up through a gap called a vent.
- The magma reaches the surface cools and hardens . This is called lava.
- After many eruptions many layers of lava creates a cones shaped mountain.
- The top of the volcano where lava flows out is called the crater.
Types of volcano.
Active - erupted in the past 10,000 years ( Mt .Helen's USA).
Dormant - has not erupted in the past 10,000 years but may erupt again ( kilimanjaro Tanzia).
Extinct - never expected to erupt again.(Mount Kenya, Kenya).