Fresh water resources are not distributed evenly because some places are more dry than other like the deserts in the middle east and africa.
<span>Gypsum originated 200 million years
ago as a result of marine deposits when part of what are now our continents
were immense oceanic extensions. During this period some seas were dried
leaving plaster beds that were covered to be discovered later by man. Since the
time of memory plaster has coexisted with humanity and constitutes one of the
oldest building materials.</span>
Flood control, house of living things and keep water purified
Nile and the Tigris-Euphrates
Answer: covers one half of he earth. Deserts only make up about 33% of the earth.
