Eruptions Quiz

List the 5 forms of tephra (pyroclastic materials) in order of smallest to largest.

• Dust, Ash, Lapilli, Bomb, Block

• Ash, Dust, Lapilli, Block, Bomb

• Lapilli, Ash, Dust, Bomb, Block

• Block, Bomb, Lapilli, Ash, Dust

Increasing silica content increases ____________?

• Explosivity

• Viscosity

• Density

• Temperature

Darker color rocks means what about the silica content?

• Less/low silica content

• High silica content

• No silica content

• Average silica content

What are the three types of magma?

• Basalt, Andesite, Rhyolite

• Granite, Diorite, Gabbro

• Obsidian, Pumice, Scoria

• Peridotite, Dunite, Komatiite

Tags

NGSS.HS-ESS2-3

What is the difference between magma and lava?

• Magma is found in the mantle (beneath the surface); Lava is found on the surface (crust)

• Magma is only found in oceans; Lava is only found in deserts

• Magma is a type of rock; Lava is a type of metal

• Magma is always cold; Lava is always hot

Name 3 indicators of an active volcano.

• Gas composition, Seismic activity, Rock fracturing

• Low rainfall, High humidity, Dense vegetation

• Cold temperatures, Snowfall, Ice formation

• Lack of animal life, Dry soil, Sparse vegetation

What kind of crust causes the most explosive volcanoes?

• Continental crust

• Oceanic crust

• Basaltic crust

• Mantle crust

Tags

NGSS.MS-ESS3-2

The VEI index scale is used to measure:

• Earthquake intensity

• Volcanic eruption explosiveness

• Tsunami height

• Hurricane strength

Fill in the blank: VEI or _______ is used to provide relative measures of the explosiveness of a volcano.

• volcanic explosivity index

• volcanic energy indicator

• volcanic eruption intensity

• volcanic emission index

What is the range of the Volcanic Explosivity Index (VEI)?

• 1 to 10

• 0 to 8

• 5 to 15

• 0 to 5