Questions

Desertification is a type of land degradation in which a relatively dry area of land becomes increasingly arid, typically losing its bodies of water as well as vegetation and wildlife.

Conversion of a grassland or an already arid land into a desert through indiscriminate human actions magnified by droughts.

Hence, forest improving to deserts is refers to desertification.

Acropolis

There are many reasons why a constitution is needed. One of the primary purposes is to define and limit power of the government.

It gives the structures for the functioning of the country such as courts and parliament and limits the power.

e.g. to imprison without trial for the government.