Volcanoes

Formation:

found at constructive & destructive plate margins

Destructive

oceanic subducts under continental as more dense.

Formation:

• oceanic plate subducts into mantle; melts and destroyed.
• pool of magma forms
• magma rises through cracks in crust (vents)
• magma erupts on surface (where called lava), forming volcano.

Constructive

• magma rises up into gap formed when plates move apart

some volcanoes form over hot spots (really hot parts of mantle) eg Hawaii

Types of volcano:

Composite:

• made of ash…