1st way is chopping trees for wood. 2nd would be pollution by fossil fuel.
Found at the lowest point of a large drainage area, these seasonal, marsh-like ponds collect and store water from rain and runoff. Unlike vernal pools, playas generally fill when temperatures are unsuitable for plant growth, and often the water is salty, alkali or both.
source- google
4. The Roman Empire
( Muslim Empire is not a thing)
1. Where are things located
And 2. Why are they there
