Answer: Twice
Explanation: With quadratic functions they are usually represented by parabolas and they can cross the x axis only once or twice :)
The first answer is answer. not a process, so it can't be the correct answer.
The second answer refers to the process of liquids changing their state to gas- so it's also not the correct answer.
The correct answer is the last one: desertification!- this is the process when a place becomes a dry and plantles ground.
A tributary is the name given to a river or stream that flows into a main river.
