Volcano Notes Review

Look at the image! What do the arrows show about the movement of lithospheric plates causing volcanic eruptions?

• Convergent boundaries

• Divergent boundaries

• Transform boundaries

• Hotspots

What is a volcano? A volcano is any place where lava, ash or molten __________________ come out of the ground.

• rock

• metal

• glass

• plastic

What is a volcano? A volcano can ALSO be where a ________________________ forms when layers of lava and ash erupt and build up.

• stream

• mountain

• river

• forest

Why do volcanos erupt? Volcanoes form and erupt where plates are moving apart (____________________ boundaries).

• transform

• continental

• divergent

• oceanic

Why do volcanos erupt? Volcanoes form and erupt where plates are moving together (____________________ boundaries).

• divergent
• transform
• subduction
• convergent

Why do volcanos erupt? Volcanoes can also form and erupt at locations called ________________ spots.

• hot

• cold

• wet

• dry

How do volcanoes form on land?

Volcanoes form when one tectonic plate moves ________________ another.

• volcanic

• under

• beside

• over

How do volcanoes form on land?

• Volcanoes form from the cooling of ocean water.
• Volcanoes develop from the accumulation of sediment in riverbeds.

• Volcanoes are created by the erosion of mountains over time.
• Volcanoes are created when denser oceanic plate subducts under lighter continental plates

Volcanoes erupt along cracks that are opened in the ocean floor by the spreading of two plates called a _____________________.

• mid-ocean ridge

• fault line

• hot spot

• trench

Magma from Earth's upper ______________ rises to fill these cracks. The lava cools and forms new crust on the edges of the cracks.

• atmosphere

• pie

• mantle

• metal