Define sustainable development.

Sustainable development is the development of a country or world not only at present, but the development which is to be continued and maintained for future generations.

For example, groundwater is a natural resource which is replenished by nature.

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.