The ring of Fire is a long string of volcanoes located around the edge of _____________________.

• The Pacific Ocean• The Atlantic Ocean• Africa• Australia

Where do most volcanoes occur?

• In the tropics• In the middle of tectonic plates• Along the edges of tectonic plates• Along earthquake faults

Which of these geologic formations would probably be found along the boundary where two tectonic plates meet?

• A plateau• A natural bridge• A volcano• An ocean

Where are most volcanoes located?

• In Africa• In the middle of tectonic plates• Along the edges of tectonic plates• In the middle of continents

Along the west coast of South America, one plate is diving beneath another plate, creating volcanic mountains. This process is known as_____________________

• Subduction• Faulting• Isostasy • sedimentation

New islands are continuously being formed in the Hawaiian Island chain because___________________.

• A rift valley is opening up in the Pacific Ocean• The pacific plate is moving over a hot spot• The islands are moving over a plate boundary• The islands are sinking into the Earth’s crust

What are the two main gasses released by volcanoes?

• Hydrogen and helium• Argon and neon• Methane and propane• Water vapor and carbon dioxide

What property of liquid rock enables it to rise up through cracks in the earth’s crust?

• Color: Liquid rock is lighter in color than solid rock

• Texture: Liquid rock is smoother than solid rock

• Density: Liquid rock is less dense than solid rock

• Temperature: Liquid rock is hotter than solid rock

Why would it be more likely that you would see lava as opposed to magma?

• Lava is the term for magma after it has flowed out of the ground

• Magma is much hotter than lava so you can not see it as well.

• Magma can only be found and seen at the bottom of the ocean.

• Magma is much darker in color than lava so it is harder to see.

What do minor earthquakes in the vicinity of a volcano indicate?

• There is a fault inside the volcano• The tectonic plates are moving• Magma inside the volcano is getting hotter• Magma inside the volcano is rising

What causes molten rock to explode out of a volcano?

• Gravity• Earthquakes• Expanding gases• inertia

How is a volcano like a water faucet?

• Both a volcano and a water faucet can be turned on and off at will

• Both a volcano and a water faucet work because of a difference in temperature

• Both a volcano and a water faucet have chambers directly below them

• Both a volcano and a water faucet are locations where a fluid can flow out of an otherwise closed system.

Magma inside the earth may start to rise because it is ________________than the surrounding rock.

• Less dense• More dense• Cooler• More viscous

Why do most volcanoes form near the boundaries of tectonic plates?

• There are week spots at the boundaries so magma can erupt there

• Magma can rise up between the plates when the plates move apart at these boundaries

• Magma is stronger near the boundaries of tectonic plates so this where volcanoes often form.

• There is an abundance of magma at the boundaries of tectonic plates so eruptions often occur here.