Earthquakes and Volcanoes Practice

Primary waves ____ when they hit the liquid outer core.

• slow down

• stay the same

• stop

• speed up

How many volcanoes erupt each year, on average.

• less than 5

• around 20

• around 60

• more than 100

Kilauea in Hawaii is the world's most ____ volcano.

• dormant

• active

• explosive

• all of the above

Indicate whether the statement is true or false. Gas trapped in magma under high pressure can cause explosive eruptions.

• True

• False

Tags

NGSS.MS-ESS3-2

How does the amount of silica content change the viscosity of magma? How does this affect the flow of the magma?

• A low silica content leads to a low viscosity and a slower rate of flow.

• A low silica content leads to a high viscosity and a slower rate of flow.

• A low silica content leads to a low viscosity and a faster rate of flow.

• A low silica content leads to a high viscosity and a faster rate of flow.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which factor does NOT effect the speed of a seismic wave?

• temperature

• season of the year

• chemistry of the rocks

• pressure

At least ____ seismographs are needed to accurately locate an earthquake epicenter.

• two

• five

• four

• three

Volcanoes can form over a plume, or rising current of hot mantle. As a tectonic plate slowly moves over a plume, a volcano will form and then die as it moves away from the hot spot. Then the next volcano will form. If the hot spot shown made all the islands in the figure, is the plate pictured below moving toward you or away from you?

• The plate is moving toward me.

• The plate is moving away from me.

• There is no way to tell.

• It is stationary.

Tags

NGSS.MS-ESS2-3

Along a(n) ____ fault, rock above the fault surface moves upward in relation to rock below the fault surface.

• normal

• reverse

• elastic

• strike-slip

When the force on rocks is great enough, they break, producing vibrations called ____.

• faults

• earthquakes

• strains

• stresses