U6 Review

Weak spot in earth’s crust where molten material, or magma, comes to the surface

• Island Arc

• Volcano

• Hot Spring

• Old Faithful

molten mixture of rock-forming substances, gases and water from the mantle

• Magma

• Lava

• Hot Spring

• Gyser

molten material that reaches the earth's surface

• Magma

• Lava

• Hot Spring

• Gyser

Major belt, formed by many volcanoes that rim the Pacific Ocean.

• Magma

• Lava

• Hot Spring

• Ring of Fire

string of islands created by volcanoes near boundaries where two oceanic plates collide and one sinks beneath the other

• Island Arc

• Hot spot

• Shield Volcano

• Pipe

area where material from deep within the mantle rises then melts, forming magma; a volcano forms above a hot spot when magma erupts through the crust

• Island Arc

• Hot spot

• Shield Volcano

• Pipe

magma has low silica content, flows easily and erupts quietly with gases bubbling out gently and lava oozing quietly producing both pahoehoe (fast moving hot lava) and aa (lava that is cooler and slower-moving)

• Quiet Eruption

• Volcanic Overflow

• Explosive Eruption

• Hot Spot Eruption

– has magma high in silica with trapped gases building up pressure until they explode with incredible force creating a pyroclastic flow, or an eruption that hurls out ash, cinders and magma bombs.

• Quiet Eruption

• Volcanic Overflow

• Explosive Eruption

• Hot Spot Eruption

not active, but may become active

• Extinct Volcano

• Active Volcano

• Dormant Volcano

unlikely to erupt again

• Extinct Volcano

• Active Volcano

• Dormant Volcano