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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.Cauldron subsidence takes place
during a volcanic eruption
in an extinct volcano
in an active volcano
within a short period of time

4.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.

5.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

6.What is a geyser?
A natural fountain that throws up jets of hot water
Gushes of hot water on the land surface that comes from underground.
A kind of rock formed by volcanic eruptions.
None of the above.

7.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.

8.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.

9.Which of the following is true about explosive volcanic eruptions?
They do not cause pyroclastic surges and debris avalanches.
The large amounts of ash produced cannot cause a major damage to aviation.
They don't produce nuées ardentes.
They are devastating and can be very dangerous to people.

10.Which of the following is not a consequence of a volcanic eruption?
Caldera
A lot of rain near the volcano during an eruption
A rain of ashes and mud from the volcanic eruption can overwhelm cities
Earthquakes