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1.Which of the environmental problems is not caused by volcanoes?
Rains of Ash can cause houses to collapse.
Breathing problems.
Major damage to aviation.
None of the above.

2.Volcanic eruption cannot
Drastically alter vast areas of land.
Temporarily change Earth's climate.
Result in landslides.
Result in fold mountains.

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

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

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.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

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 false?
There is a system of mid-oceanic ridge that stretches for 50,000 miles through the world's oceans.
The effects on the climate depend on the size of the particles in the material released by explosive eruptions.
Volcanic eruptions do not release sulphur dioxide into the air.
Some geysers gradually lose their power and stop erupting as the volcanic heat dies down.