Geography Worksheet:
Volcanoes:
Fill in the blanks:
1.A volcano begins as a hole or crack in the Earth’s crust.
2.When the volcano erupts, molten rock, smoke, dust, ashes and gases escape through
the opening.
3.Two
thirds of the world’s active volcanoes are found around the
edge of the Pacific Ocean.
4. Where the Earth’s crust thin or weak, magma
collects in large pools.
5.Magma flows up the passage called the vent.
6.When an undersea volcano erupts, it forms a new
island.
7. The Hawaiian Islands in the Pacific Ocean were
formed by undersea volcanoes.
8.The world’s highest active volcano is Ojos del
Salado in Chile, South America.
9. Ojos del Salado in Chile is 6887 meters tall.
10. A volcano that is erupting, or can still erupt, is
called an active volcano.
11.There are about 1300 active volcanoes in the world.
12.Volcanoes that have not erupted for a long time are
called sleeping, or dormant volcanoes.
13. If a volcano hasn’t erupted for at least 10000
years it is called an extinct volcano.
14.Eldfell volcano on island near Iceland erupted
violently and destroyed 300 buildings in 1973.
15.The hot, runny rock is under the surface of the
Earth is called Magma.
16. When magma comes out of a volcano it is called Lava.
17. The lava, dust and ashes that comes from the
volcano may form a hill or mountain over time.
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