Front

A useful material that can be drawn from when needed is called a _____

Back

a resource

Front

A challenge or situation that needs to be solved is called a _____

Back

a problem

Front

A means of dealing with a difficult situation is called a _____

Back

a solution

Front

What is the name of the  long channels, built by the Romans, to carry water to cities?

Back

aqueducts

Front

Which river flows through the city of Rome? Options: the Po River, the Tigris River, the Tiber River, the Euphrates River

Back

the Tiber River

Front

Why was water from the Tiber River undrinkable by the Romans?

Back

it was polluted

Front

The factories in Israel that remove the salt from the saltwater are called _____

Back

desalination plants

Front

In most cases, the process of getting the salt and other impurities out of the water _____

Back

is not very practical

Front

Humans go through freshwater quickly by turning it mostly into _____

Back

urine and sweat

Front

What percentage of the water used by astronauts is recovered?

Back

93 %