Answer:
3 main causes are
Overgrazing, Deforestation, and Farming practices
out of these it would be Overgrazing which has caused various causes of desertification whichever letter that is its kinda confusing
The only time that both hand valves of a manifold gauge set should be open at the same time is during system charging.
To diagnose and repair cooling or refrigeration systems, manifold gauge sets—also called HVAC gauges or refrigeration gauges—are frequently employed. They measure low- and high-refrigerant pressure using mechanical or digital gauges to identify issues like leaks or to help with system evacuation and recharge.
In manufacturing and engineering, a gauge, usually spelled gauge, is a tool used to assess if one dimension is larger or smaller than another that is used as a reference standard.
Learn more about gauge set here
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He did this by conquering the Lower Egypt, which at that time was held by the Hyksos (Asiatic People of multi-ethnic origin). Around 1500 BCE Ahmose drove the Hyksos out and then declared himself king of all Egypt.
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<em>hope that helps</em>