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1.Which of the following is the correct definition of a pyroclastic flow?
Mixtures of hot gas and ash that travels quickly down the slopes.
Gushes of hot water that is found on the land surface.
Hot and choking lava that travels slowly down the slopes.
Mixture of magma with water.

2.Which of the following means "glowing avalanche"?
Lava fountain.
Nuée ardente.
Debris avalanche.
Lahar.

3.Which of the following is not related to nonexplosive volcanic eruptions?
Gently flowing lava
Flood basalts
Pyroclastic surges
Kilauea Volcano

4.Worldwide effects of volcanic eruptions occurs when there are
nonexplosive volcanic eruptions that involves a large area being covered by lava.
large, explosive eruptions that throw material into the stratosphere.
Major damage of aviation due to volcanic ash.
Sudden volcanic eruptions from dormant volcanoes.

5.Volcanic plugs are formed when
lava solidifies in the crater of an extinct volcano.
Lava solidifies on the cone of an active volcano.
A volcano is formed.
Lava solidifies in the pipe of an extinct volcano.

6.The formation of a geyser involves each of the following except
rainwater seeps through cracks in rocks and drains into a crevice
heat from the hot rocks below the crevice heat up the water
the intense heat boils the water
the pressure from the magma below pushes the steam up to the land surface

7.How are calderas formed?
Eruption of huge volumes of pyroclastic materials, causing the roof of the magma chamber to be unsupported and fall downwards into the chamber.
Cauldron subsidence
After numerous eruptions, the crater becomes bigger.
A and B

8.The following involves the formation of hot springs except
rainwater seeps through cracks and drains into a crevice
As molten materials deep in the earth cool down, they give of water vapour.
The vapour find its way up through cracks in the rocks, cooling as it goes, until it condenses.
It gushes from the ground to form a hot spring.

9.Which of the following is true?
Worldwide effects of volcanic eruptions only occur when there are huge explosive eruptions that throw materials into the troposphere.
Explosive volcanic eruptions do not cause landslides.
El Nino is a huge disruption of the Earth's plates.
Crater lakes are formed when water is collected in craters.

10.Which of the following is true about non-explosive volcanic eruptions?
They result in quiet emissions of lava flows.
These do not form spatter cones.
Lava flows from these eruptions always cover vast areas.
They usually kill people.