This is the an area drained by a river, stream, or other water source.

Example: This can also be called a drainage basin.

Watershed

Explanation:

A watershed is an area drained by a river, stream or other water sources.

Most water shed are usually separated from one another by a continental divide. Such divides are extensive mountain ranges from which the rivers/streams takes their source. They flow into their drainage basin usually the ocean most times. Most watersheds are usually regions of good and fertile lands. Watershed drains all the rivers and streams in an area.

You would be correct, boiling water does disinfect contamination.    the property of disinfecting means to kill  germs, bacteria and other pathogens or contamination  that might cause an infection or cause a person to become sickly. a couple methods of disinfecting are using soap, other cleaning supplies or by simply "boiling" the contaminate.  the reason why boiling water disinfects certain attributes is because some cells cannot survive the heat and pressure.

C) the increase in atmospheric pressure pushes the walls of the balloon outward thus making it  is the answer.hope i you.