Why has the Aral Sea shrunk and become saltier? The climate has become more tropical.
A water pipeline has drained the lake.
Water was diverted from rivers to feed cash crops.
Factories have used up water resources.

Once the fourth largest lake in the world, Central Asia's shrinking Aral Sea has reached a new low, thanks to decades-old water diversions for irrigation and a more recent drought. Satellite imagery released this week by NASA shows that the eastern basin of the freshwater body is now completely dry.

The climate has become more tropical

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true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.