Quiz 6

Question 1

Example of oceanic/oceanic convergent plate boundary

Answer 1

Japanese islands

Question 2

Example of oceanic/continental convergent plate boundary

Answer 2

Andes mountains

Question 3

Earthquakes get ____ as the plate subducts further and further/deeper and deeper below ground

Answer 3

Deeper

Question 4

Forms as sediments on the going down slab are scraped off (during oceanic/continental)

Answer 4

Accretionary prism

Question 5

Forms the “Ring of Fire”

Answer 5

Pacific plate subducting downward

Question 6

USGS volcano alert names and colors

Answer 6

Normal, green
Advisory, yellow
Watch, orange
Warning, red

Question 7

Volcano advisory

Answer 7

Volcano is exhibiting signs of elevated unrest above background level OR volcanic activity has decreased significantly but continues to be closely monitored for possible renewed increase

Question 8

Volcano watch

Answer 8

Volcano is exhibiting heightened or escalating unrest with increased potential of
eruption, timeframe uncertain; OR eruption is underway but poses limited hazards

Question 9

Volcano warning

Answer 9

Hazardous eruption is imminent, underway, or suspected

Question 10

Harmonic tremor

Answer 10

Long-lasting, continuous release of seismic energy, typically associated with shallow, underground movement of magma
Greatly contrasts the sudden release of seismic energy that occurs with slippage along a fault

Question 11

Volcanic gas

Answer 11

SO2 (sulfur dioxide)

Question 12

Pyroclastic flows

Answer 12

Avalanches of intensely hot rock and volcanic gases

Question 13

Lahars

Answer 13

Slurries of mud and boulders

Question 14

What happens to viscosity as the amount of dissolved gases increases?

Answer 14

Viscosity lowers (flows easier)

Question 15

Pyroclastics

Answer 15

fragmentary volcanic
rocks of various sizes
ejected into the air

Question 16

3 types of volcanic ejecta

Answer 16

Volcanic ash, cinders, and volcanic bombs

Question 17

Volcanic ash

Answer 17

Very fine dust

Question 18

Cinders

Answer 18

Gravel-sized pieces of ejecta

Question 19

Volcanic bombs

Answer 19

Fragments of ejected magma that become rounded and cool/solidify as they fly through the air

Question 20

Fumaroles

Answer 20

Volcanic vents emitting gases, some charged with dissolved minerals

Question 21

Geysers

Answer 21

Heated hydrothermal waters under pressure, that intermittently erupts at the surface