Science 8th Grade Volcanoes and Earthquakes

Explosive of Magma depends on:

• Amount of dissolved gas

  (Especially Water Vapor)

• Amount of viscosity

• Amount of heat outside

• Amount of magma (surrounding volcano)

Mud Flows form when

• Snow mixes with lava around a volcano

• Lava flows down a grassy hill

• Thermal energy from an erupting volcano melts snow

• Kinetic energy from a volcano heats the air surrounding it

Basalt is (Select all that apply)

• Magma with low silica content

• Magma with high silica content

• Formed along hot spots and mid ocean ridges

• Formed inside the volcano

Pyroclastic Flow is (Select all that apply)

• containing Rock

• Fast moving avalanche

• Hot gas

• Slow moving avalanche

• containing ash

Volcanic Ash

• Includes tiny particles of pulverized volcanic rock and glass

• Large amounts can fall during an explosive eruption

• Small amounts can fall during an explosive eruption

• Includes large chunks of pulverized volcanic rock and glass

• Can cool down the environment when spit into the atmosphere

Magma

• Solidified rock above Earths surface

• Solidified rock below Earths surface

• Molten rock below Earths surface

• Cooling molten rock above Earths surface

Plumes

• Places where cooler magma rises due to surface currents in the mantal

• Places where cooler magma rises due to convection currents in the mantal

• Places where hot magma rises due to surface currents in the mantal

• Places where hot magma rises due to convection currents in the mantal

Volcanic Ash

• Made up of small particles of pulverized volcanic dust and sand

• Made up of tiny particles of pulverized volcanic rock and glass

• Made up of large particles of pulverized volcanic rock and glass

• Made up of large particles of pulverized volcanic dust and sand

Viscosity (Select all that apply)

• Fluids ability to flow smoothly

• Fluids resistance to flow

• Higher when magma has low silica content

• Lower when magma has high silica content

• Higher when magma has high silica content

Eruption Style depends on

• Amount of solids dissolved in magma (especially amount of volcanic vapor)

• Amount of gases dissolved in magma (especially amount of water vapor)

• Amount of gases dissolved in magma (especially amount of carbon vapor)

• Amount of solids dissolved in magma (especially amount of carbon vapor)