An earthquake is one of the worst natural disasters on our Earth. We think that the ground we stand on is very stable, but it isn’t. It moves quite a lot. In the last few decades, scientists have been able to find out why earthquakes happen.
Earthquakes happen when there is a sudden vibration in the Earth’s crust. It’s like a large lorry that travels down your street. When it passes by, you feel your house shake.
Contents (23 pages)
- Introduction
- How plates move
- Where earthquakes happen
- Earthquake waves
- How earthquakes are measured
- Effects of earthquakes
- The greatest earthquakes in history
- Exercises
- Word list
- Key
Series of earthquakes in East Azerbaijan in 2012
Image: Mardetanha, CC BY-SA 3.0, via Wikimedia Commons
