Why is it an environmental problem to simply discard wastewater without cleaning it?

Because Earth has a very small and limited supply of usable freshwater.

Because wastewater can be sold to other countries for a high price.

Because dirty water evaporates faster than clean water, affecting weather patterns.

Because it costs too much money to build new pipes to carry it away.

If a town's population grows and more factories are built without any water treatment, what is a likely consequence?

The air quality in the town will get better.

There will be more clean water available for drinking.

Local rivers and groundwater will become polluted.

The cost of water for residents will decrease.

It contains harmful substances.

It has already been used by plants.

Water that has been purified for drinking.

Water in its natural state, such as in rivers or lakes.

Water that has been used by humans and now contains harmful substances.

Rainwater that is collected in barrels.