Effects of volcano eruption

Why does the volcanic eruption happen ?

• When the pressure on magma chamber inside earth increase and push magma to the surface.

• When it formes by eruption lava and ash.

• when rock underground suddenly breaks along a fault.

Volcanoes create new land on the Earth’s surface when –

• lava flows then cools and hardens to form rock.

• an eruption destroys the side of a mountain.

• magma forms giant underground chambers.

• saltwater touches lava and changes into steam.

Volcanoes only exist in land.

• True

• False

Volcanoes can cause...

• Global cooling

• earthquakes

• release of poisonous gases

• all of the above

Dust and ash from a volcanic eruption can be carried...

• Dozens of miles

• Hundreds of miles

• Thousands of miles

• All of the above

A large lava flow can be stopped or redirected by people.

• True

• False

About 75 percent of the world’s volcanoes are found

• around the Atlantic Ocean basin

• around the Pacific Ocean basin

• throughout the American Northwest

• along the mid-Atlantic ridge