Discuss how lakes and ponds are created through tectonic activity or glaciation.
Examine how tectonic activity can create either high salinity lakes and ponds by land rise in the ocean, or fresh water lakes and ponds through land splitting in deep fissures which fill with water. Indicate how glacial movement scrapes large depressions in the land which fill with water. Examples are the formation of the
Great Lakes in the US.
Discuss how atmospheric water is essential to global distribution, especially in arid areas. Analyze how extreme droughts can occur which kill people, cattle and crops. These droughts are made worse by increased population and water use. Indicate how topsoil can blow away, soil can harden and become impenetrable, leading to runnoff and flooding when the drought is ending.