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10 tháng 2 2016
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7 tháng 4 2021
Today I want to talk about earthquake, a natural disaster that can cause great damage and happen regularly.
Most people think that earthquakes happen sometimes. However, earthquake happens all the time. Most of the time, we don't feel earthquakes as they are too small to reach us. Sometimes, they are so strong that they can be felt over thousands of miles way.
What is earthquake?
Earthquake is a sudden movement of the Earth's surface. It can cause great damage. It is caused as the tectonic plates of land hit, bump or slide past each other.
How can we know when earthquake happens?
When an earthquake happens, we feel vibrations. We can see that objects are shaken and may fall.
Why eartquake happens?
That is because our lands are formed by many distinctive plates. When those plates are forced over, drifted apart or slip by each other; earthquakes are caused.
What are the uses of earthquakes?
They can give birth to hills, mountains, holes as well as new oceans. On the negative sides, earthquakes can cause fires, tsunamis, landslides or avalanches.
In Vietnam, there are lots of earthquake and most of them are not very big. When earthquake happens, we should protect ourselves right away to stay safe.
Chúc em học vui vẻ và có nhiều trải nghiệm thú vị tại Hoc24.vn nhé!
a) Xét tam giác BAE và tam giác BKE có:
góc ABE = góc KBE(BD là phân giác(gt))
BE chung
góc BEA = góc BEK =90độ(gt)
=>tam giác BAE = tam giác BKE(gcg)
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