Igneous Activity

Review

Igneous Activity click for Final ?

Magma/Lava Pyroclastics Volcano Characteristics

Infamous Volcanoes

Viscosity

200 200 200 200 200

400 400 400 400 400

600 600 600 600 600

800 800 800 800 800

1000 1000 1000 1000 1000

Magma/Lava for 200

• What % of lava is gaseous?

Magma/Lava 200

• 1 to 5 % by weight is gaseous.

Magma/Lava 400

• Gases most often emitted by volcanoes.

Magma/Lava 400

• Water vapor and carbon dioxide.

Magma/Lava 600

• Lava with spiny, sharp projections.

Magma/Lava 600

• aa– Spiny with sharp edges– slightly more viscous

Magma Lava 800

• Describe pahoehoe.

Magma/Lava 800

• Not viscous

• Low in silica

• Very hot

• Smooth, ropy texture

Magma/Lava 1000

• What is the neck of a volcano?

Magma/Lava 1000

• The resistant rock exposed after the rest has been eroded away.– Ship Rock, New Mexico

Pyroclactics 200

• What is the smallest pyroclastic?

Pyroclastics 200

• Ash

Pyroclastics 400

• Describe nue’e ardente.

Pyroclastics 400

• Firey gas and ash moving down the mountain at 200 km/hr.

Pyroclastics 600

• Describe lahar.

Pyroclastics 600

• River of mud and ash from the top of a stratovolcano.

Pyroclastics 800

• What becomes “air streamed” after ejection?

Pyroclastics 800

• Lava bombs.

Pyroclastics 1000

• Pyroclastics about the size of walnuts are called _____.

Pyroclastics 1000

• Lapilli

Volcano Characteristics 200

• Volcano type typically has a quiet eruption.

Volcano Characteristics 200

• Shield volcano

Volcano Characteristics 400

• Volcano type has a violent eruption.

Volcano Characteristics 400

• Stratovolcano or Cone

Volcano Characteristics 600

• Typically the highest volcanoes from sea level.

Volcano Characteristics 600

• stratovolcanoes

Volcano Characteristics 800

• Smallest volcano type.

Volcano Characteristics 800

• Cone

Volcano Characteristics 1000

• Describe caldera.

Volcano Characteristics 1000

• Volcanic crater at least 1 km wide.– Yellowstone National Park

Infamous Volcanoes 200

• Which well known volcano is in Hawaii?

Infamous Volcanoes 200

• Mauna Loa

• Kilauea

Infamous Volcanoes 400

• Which large caldera is in the middle of N.A?

Infamous Volcanoes 400

• Yellowstone National Park

Infamous Volcanoes 600

• Why is Mt. St, Helens well known?

Infamous Volcanoes 600

• Erupted in 1980

• Lost most of its top

• Large lahar

• Was the last catastrophic eruption in the continental U.S.

Infamous Volcanoes 800

• Which volcano is currently erupting in Alaska?

Infamous Volcanoes 800

• Mt. Redoubt (2009)

Infamous Volcanoes 1000

• Why is Vesuvius well known?

Infamous Volcanoes 1000

• Large nue’e ardente

• Covered city of Pompeii

• People and animals perserved in ash

Viscosity 200

• Magma higher in silica is ____ viscous.

Viscosity 200

• more

Viscosity 400

• Describe the viscosity of basaltic lava.

Viscosity 400

• Not Very viscous

Viscosity 600

• Describe the viscosity of granitic lava.

Viscosity 600

• Very viscous - high in silicates

Viscosity 800

• The higher the temp. the ____ viscous.

Viscosity 800

• less

Viscosity 1000

• Describe viscosity.

Viscosity 1000

• A measure of a material’s resistance to flow.

• More viscous, more slow

Final Question

• Where are most of the world’s volcanoes located?

Final Question

• Ring of Fire

• Around the Pacific Ocean