The Human Development Index (HDI) includes measures of

HDI classify between countries on the basis of their:

1- per capita income

2- literacy rate

3- net attendance ratio

4- life expectancy from birth

UNDP uses criterion of HDI is classify countries.

places of higher salinity. there are parts of the ocean where hardly any rain falls but warm dry winds cause lots of evaporation. this evaporation removes water – when water vapour rises into the atmosphere, it leaves the salt behind, so the salinity of the seawater increases. this causes the seawater to become denser.