8th science ch. 4 lesson 4

a structure that forms in Earth's crust when molten material, or magma reaches

the earth's surface

• volcano

• mountain

• ridge

• tsunami

Volcanoes can .....

• form new material on Earth's surface

• release gasses into the atmosphere

• build new islands in the ocean

• shape habitats for organisms

When lava cools, it forms....

• solid rock

• it doesn't cool

• ashes

Most volcanoes form along which type of boundaries?

• divergent boundaries

• convergent boundaries

• transform boundaries

Most volcanoes that form at divergent boundaries, occur .................

• at mid ocean ridges

• near mountain ranges

• along islands

• along faults

an area where lava frequently erupts at the surface and is completely independent of

the plate boundary process

• hot spots

• lava pockets

• plate pockets

• eruption spots

As plates move over the plume, _____________ is created

because older volcanoes keep being carried away from the hot spot.

• a chain of volcanoes

• a series of tsunamis

• a group of hot spots

Which is an example of older volcanoes being carried away from hot spots and

forming a chain of volcanoes?

• Hawaii

• Florida

• Alaska

• Maine

where magma collects before an eruption

• magma chamber

• hot spot

• lava pool

• pipe

place in a volcano where magma moves up from the chamber which leads to

central vent

• pipe

• magma chamber

• side vent

• shield