Volcanoes

What is the Mid-Atlantic Ridge?

• The longest mountain range in the world, located underwater between the African and American continents.

• A large volcano in the Pacific Ocean.

• A deep trench in the Atlantic Ocean.

• A series of islands in the Caribbean Sea.

What are rift zones?

• Areas where Earth's plates move away from each other, forming fractures and faults.

• Zones where earthquakes are most frequent.

• Regions where Earth's plates collide and form mountains.

• Deep ocean trenches formed by plate movements.

How are volcanoes formed along rift zones?

• By the movement of molten lava to the Earth's surface between diverging plates.

• Through the accumulation of sediment in rift zones.

• By the cooling of magma deep within the Earth.

• Through erosion caused by wind and water.

What is a common feature of active volcanoes?

• They are usually found at or near plate boundaries.

• They are inactive and do not erupt.

• They only form under continental plates.

• They are predominantly underwater and unseen.

What happens when an oceanic plate is pulled under a continental plate?

• It heats up, becomes magma, and can rise to form volcanoes.

• It breaks into pieces and forms islands.

• It causes the continental plate to sink.

• It leads to the formation of new oceanic crust.

What is the mid-ocean ridge?

• A) A single peak under the ocean

• B) The most extensive chain of mountains on Earth, located underwater

• C) A shallow body of water in the ocean

• D) A deep trench in the ocean floor

Approximately how long is the mid-ocean ridge?

• A) 10,000 kilometers

• B) 65,000 kilometers

• C) 90,000 kilometers

• D) 40,390 kilometers

What percentage of the mid-ocean ridge is underwater?

• A) 75 percent

• B) 80 percent

• C) 90 percent

• D) 100 percent