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Facts About Volcanoes!

Magma is liquid rock inside a volcano.

Lava is liquid rock (magma) that flows out of a volcano. Fresh lava ranges from 1,300° to 2,200° F (700° to 1,200° C) in temperature and glows red hot to white hot as it flows.

There are around 1510 ‘active’ volcanoes in the world. We currently know of 80 or more which are under the oceans.

When magma erupts through the earth’s surface it is called lava.

Over half of the world’s volcanoes arise in a belt around the Pacific Ocean called the Ring of Fire.

One in 10 people in the world live within ‘danger range’ of an active volcano.

People can get used to living near a volcano, but it is always a little dangerous. Scientists have estimated that at least 200,000 persons have lost their lives as a result of volcanic eruptions during the last 500 years.

People set up homes on the slopes of volcanoes because of the rich, fertile soil produced.

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Some Mixed Facts!

When a flea jumps, the rate of acceleration is 20 times that of the space shuttle during launch.
The maximum speed that raindrops can fall at is around 18mph, depending on their size.
If every star in the Milky Way was a grain of salt they would fill an Olympic sized swimming pool.
12 Astronauts have walked on the moon, between them bringing back 382 kilograms of rocks, pebbles, sand and dust.
Whales talk to each other by making a loud clicking noise. The sound waves travel extremely well underwater and they can hear each other from 100 miles away.
A TV screen shows 24 pictures a second. Because a fly sees 200 images a second, it would see TV as still pictures with darkness in between.
Cats can see clearly in one-sixth the amount of light we humans would need.
In 1936 Professor Alfred Gaydon underwent surgery on his eyes after an accident. When his sight began to return he found that he could see ultra-violet light, which is normally beyond the visible spectrum of humans. This helped in his work as a physicist, but it did distort how he saw other colors!
Because of thermal expansion the Eiffel Tower is 15cm taller in summer.
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