Volcanoes

A cone shaped mountain that opens up to a pool of magma inside the Earth.

• volcano

• valley

• chamber

• earthquake

What is lava?

• molten rock on the surface of the Earth

• molten rock inside the Earth

• molten iron and nickel in the core

• molten iron and nickel on Earth's surface

What is magma?

• molten rock inside the Earth

• molten rock on the Earth' surface

• molten iron and nickel inside the Earth

• molten iron and nickel on the Earth's surface

Where causes the Ring of Fire?

• The Pacific plate subducting under other tectonic plates

• The North American plate subducting under other tectonic plates

• The African plate subducting under other tectonic plates

• The Eurasian plate subducting under other tectonic plates

What percent of all volcanoes are found in the Ring of Fire?

• 15%

• 25%

• 75%

• 100%

Why are some volcanoes exinct?

• they will never erupt again

• they only erupt every 10,000 years

Why do some volcanoes have explosive eruptions?

• they have a lot of gas

• their magma has LOW amounts of silica

• they have thin, runny lava

• they are not as hot as other volcanoes

Which TWO types of volcanoes are formed from explosive eruptions?

• cinder cone

• composite

• shield

Which type of eruption causes a dangerous pyroclastic flow and ash cloud to form?

• explosive

• quiet

What is a pyroclastic flow?

• hot ash, gas, and lava moving at high speed down the side of a volcano

• thin, runny lava slowly running down the side of a volcano

• a chain of volcanic islands formed from a hotspot

• the area around the Pacific Ocean where many volcanoes are found