Your Email Address (NOT required)

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

3.How can beautiful sunsets be caused by very large volcanic eruptions?
when the Greenhouse effect has been worsened by the volcanic ash
when sulphuric acid and aerosols get into the stratosphere
when the ash particles attract water droplets
when there is intense heat due to the hot lava

4.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

5.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.

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 false about explosive volcanic eruptions?
The large amounts of ash can cause breathing problems.
They produce fragmental rocks from erupting lava and surrounding country rock.
They usually don't produce pyroclastic flows.
They can cause lahars to occur.

9.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.

10.Which of the following is false about volcanoes?
They are located in the interior of continental plates.
Small active volcanoes deep in the sea can throw precious metals out of the earth.
Volcanoes can be used as a place of interest.
The formation of volcanoes is a natural process.