Sci 6 Volcanoes Chapter 1B (BJU)

molten rock within the volcano

• lava
• magma
• tephra
• ash

forms when a crack in the earth's crust allows magma and gases to come to the surface

• earthquake
• fault
• volcano
• landslide

Scientists who specifically study volcanoes

• geologists
• meteorologists
• seismologists
• volcanologists

Magma is called lava when

• it breaks through the surface of the  crust
• it is in the magma chamber
• only when it flows slowly down the volcano's side
• only when it flows quickly down the volcano's side

The magma chamber

• runs vertically upward through the center of the volcano
• allows eruptions from the side of the volcano
• is a nice place to visit
• is a pocket of molten rock in the lithosphere below a volcano

The bowl shape at the top of the main vent is called

• the crater
• the side vent
• the scoop
• the hole

An eruption that flows from the side of a volcano is called a

• side vent
• flank eruption
• pyroclastic flow
• hot spot

The thicker the lava, the more explosive the volcano is likely to be.

• True
• False

Volcanic ash is clouds filled with jagged bits of crushed rock.

• True
• False

Two-thirds of active volcanoes are found in an area around the edges of the

• Indian Ocean
• Atlantic Ocean
• Pacific Ocean
• Arctic Ocean