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Explanation:

selling oil and wadis

3. Poaching

4. Wadis

Explanation:

3. From 1978-1994, the sturgeon of the Caspian Sea has decreased from 142 million in number to 43.5 million, a 70% decline. Over-fishing for years is a major cause of this decline, exacerbated by the breakup of Russia leading to the poor management of the Caspian fisheries. ... Yes, the sturgeons plight is a serious one.

4. Wadis have braided stream patterns because of the deficiency of water and the abundance of sediments. Water percolates down into the stream bed, causing an abrupt loss of energy and resulting in vast deposition. Wadis may develop dams of sediment that change the stream patterns in the next flash flood.