- Fact 2 - Description of volcanoes:
A mountain or hill, usually more or less conical in form, from
which lava, cinders, steam, sulphur gases are ejected
- Fact 3 - Volcanoes include many of
the highest mountains of the earth, as Mount Vesuvius in Italy
(4,000 ft. high), Mount Loa in Hawaii (14,000 ft.), Cotopaxi in
South America (nearly 20,000 ft.) all of which are examples of
active volcanoes
- Fact 4 - The craters of volcanoes
are usually pit-shaped cavities, often of great size.
- Fact 5 - The summit crater of Mount
Loa has a maximum length of 13,000 ft., and a depth of nearly
800 feet.
- Fact 6 - Beside the chief crater,
volcanoes may have a number of subordinate craters
- Fact 7 - Parts of Volcanoes are as
follows: Magma Chamber, Main Vent, Crater, Pyroclastic Flow, Ash
Cloud, Volcanic Bombs, Secondary Vent and Secondary Cone
- Fact 8 - A magma chamber is a large
underground pool of molten rock beneath the Earth’s crust. It
seeps up to the surface through cracks in the crust and when it
reaches the surface, it results in a volcanic eruption. Magma
reaches the surface through several different vents
- Fact 9 - Lava is the rock expelled
from a volcano during an eruption
- Fact 10 - Lava can have a
temperature higher than 700 degrees C
- Fact 11 - A volcanic crater is a
circular dip in the ground caused by volcanic activity in
volcanoes
- Fact 12 - Pyroclastic flows are
fast moving currents of hot gas and rock with travel downhill
from a volcano
- Fact 13 - Pyroclastic flows reach
speeds of 700 km/hour
- Fact 14 - The hot gas from
Pyroclastic flows can reach temperatures of more than 1,000
degrees C and is one of the greatest dangers from volcanic
eruptions
- Fact 15 - Volcanic ash consists of
tiny pieces of rock and glass created during volcanic eruptions
which can be carried in the air for many kilometers
- Fact 16 - Volcanic bombs are
created from of lava blasted into the air which solidifies
before reaching the ground
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