What if an Asteroid hit Earth? + more videos |  

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An asteroid is a small rocky body orbiting the Sun. Millions of asteroids lie in the asteroid belt between Mars and Jupiter.
The asteroid which hit Earth almost 65 million years ago is considered to be the sole reason behind the extinction of dinosaurs.
The force with which an asteroid hits the Earth is not the only problem. The dust and smoke which rise in the atmosphere after the impact, block the sunlight, resulting in the lowering of overall temperature and eventually leading to the death of a number of species.
If an apartment sized asteroid were to hit Earth, then it would probably wipe out a small city.
If a 20 storied building sized asteroid were to hit Earth, then it might completely flatten a small country.
References:
science.howstuffworks.com/nat...