قطعه مناسبه لاختبار Flying High

Many disasters are caused by man . They are either deliberate or uncontrolled . They
include pollution , extinction of animals , deforestation and wars . However , some disasters are natural . They include floods , earthquakes , hurricanes and droughts .
An earthquake is a sudden and rapid shaking of the earth surface . A drought is a long period of dry weather . It can have a serious impact on economics if it prolonged for a long time .While a hurricane is a very violent wind.

Questions
What is an earthquake ?
.................................................. ..............................................
Is pollution a man -made disaster?
.................................................. ...............................................
When can a drought be dangerous ?
.................................................. .............................................
Write the opposite of
wet X ......................
short X .........................
man - made X .......................

What do these words mean in English ?
rapid .................................................. .................................................. ...........
prolonged …………………………………………� �………………………..

Extra Information


Why do earthquakes happen?

The surface of the earth has not always looked as it does today; it is moving continuously (although very slowly) and has done so for billions of years. This is one cause of earthquakes, when one section the earth (tectonic plate) collides with another. Scientists can predict where (but not when) this might happen and the area between plates is called a fault line. On one fault line in Kobe, Japan in 1923 over 200,000 people were killed. However, earthquakes do not always happen on fault lines, which is why they are so dangerous and unpredictable.

Where do volcanoes happen?

Volcanoes happen where the earth’s crust is thin - lava, dust and gases burst out (erupt) from beneath the earth. They can rise into a massive cone shape - like a mountain and erupt, or they can be so violent that they just explode directly from the earth with no warning. There are 1511 ‘active’ volcanoes in the world. This means that they may still be dangerous. In 1985 the massive Colombian volcano Nevado del Ruiz erupted. The lava melted a glacier and sent tones of mud down the town of Armero below. Twenty thousand people died.

Can we predict earthquakes and volcanoes?

Natural disasters like volcanoes are often unpredictable. We regularly do not know when they might happen, or even where they will happen. In the future, scientists may be able to watch and predict events before they happen. This could save many lives. In South America, scientists predicted the eruption of Popocatépetl. Tens of thousands of people were safely moved just before the biggest eruption of the volcano for a thousand years. No one was hurt.

What is the difference between a Hurricane and a Tornado?

Hurricanes are extremely strong storms and often happen in the Caribbean. They cause high winds, huge waves, and heavy flooding and can be hundreds of miles across. In 1998, Hurricane Gilbert produced 160 mile an hour winds. It killed 318 people, and destroyed much of Jamaica. Tornadoes or ‘twisters’ are very strong spinning winds. They can move objects as big as a car and can blow buildings down. These are very common in West Africa and certain areas of the USA.

Can too much rain cause problems?

Floods happen in many countries after very heavy rainfall. When rain pours for weeks at a time, rivers overflow and people and property can be trapped or simply washed away. Since 1998, more than 30 people have drowned in floods in Britain. Flooding in Bangladesh caused 1300 deaths in 1989, another natural disaster.

…..and too little?

Another kind of natural disaster is a drought. This happens when there is no water, when it doesn’t rain for a long time and rivers dry up. Plants, animals and even humans die as a result of drought, for we all need water to live. Many countries today suffer from drought. This causes crops to fail, animals to die and sadly, people to starve.

Which is the most dangerous natural disaster?

All the disasters mentioned above are very dangerous and continue to kill thousands of people each year, but they are nowhere near the most dangerous disaster to ever happen on earth. One type of event in earth’s history has regularly killed millions of beings; asteroid impacts. About once every million years the earth is hit by a piece of rock and ice from space large enough to cause massive destruction (including earthquakes, volcanoes and ice ages) and sometimes to kill entire species. 65 million years ago more than half the earth’s species were killed by such an impact (including all the dinosaurs).

Disasters on the earth may seem dangerous, but the biggest threat to humans is likely to come from space.

brother
sirhasan

very good


I like it

:smile (40):

Nice and great

thanks alot
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يسر الله لكم الخير أين ما كنتم

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good job

Nice effort
thanks

thanks:smile (40)::smile (40):

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مع بالغ الشكر والعرفان

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يعطيك العافية على التميز الدائم ؟

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