When air descends it compresses. When the air compresses the molecules in the air knock into each other more often, increasing the tempertature.
Hope this helps
A beaker of black powder can be a mixture with different substances (i.e gunpowder: a mixture of sulfur, charcoal, etc.), an element which can probably be carbon (known as black), and a compound as well which can be potassium nitrate. Hence, the answer is D.
Answer:
An oxygen atom shares a single electron with each H
Explanation:
H:O:H
Covalent bond, so
An oxygen atom shares a single electron with each H.
