Predicting Eruptions

How do changes in a volcano's surface warn of an impending eruption?

• Caving in near the crater shows that magma has moved toward the main vent

• Inflation can show magma close to the surface

• The crater sinking down shows that magma is moving to the side vents

Tags

NGSS.MS-ESS3-2

How does seismic activity warn of an eruption? (Choose 2)

• Major earthquakes can trigger an eruption

• Increased minor earthquakes can warn of magma moving beneath the surface

• A sudden decrease in seismic activity can warn of a build up in pressure, meaning an eruption is coming soon

• Afterschocks following a major earthquake can trigger an eruption

Tags

NGSS.MS-ESS3-2

What is a steam eruption?

• When gasses such as water, carbon dioxide, and sulfur dioxide are released into the air

• When underwater volcanoes erupt, causing the magma to heat up ocean water

• When magma rises toward the surface, causing the groundwater to boil and releasing steam

Tags

NGSS.MS-ESS2-4

Rank the volcanic stages from LEAST likely to MOST likely to erupt.

• active, dormant, extinct

• extinct, dormant, active

• dormant, extinct, active

• dormant, active, extinct

Tags

NGSS.MS-ESS3-2

Which below is a possible cause of tectonic plate motion?

• ocean tides

• the sun

• convection currents

• current weather patterns

Tags

NGSS.MS-ESS2-2

NGSS.MS-ESS2-3

How do gas emissions warn us of an upcoming eruption?

• The presence of increased CO2 or SO2 can show that magma is close to the surface

• Gas emissions are present anytime a volcano is not dormant or extinct

• The presence of decreased CO2 or SO2 can show that magma is close to the surface

Tags

NGSS.MS-ESS3-2

What do we call the instrument used to collect seismic wave data?

• Seismogram

• Seismograph

• Damper

Answer explanation

The first seismograph was invented in 132 A.D. by the Chinese astronomer and mathematician Chang Heng.