Enter your answers in the gaps. When you have entered all the answers, click on the "Check" button.
available critical expensive frozen one plants polar precious salt three
Water is probably Earth's most
resource. After all, we can't live without it. Approximately ninety-seven percent of Earth's water is
water. The process of desalination, or removing salt from water, is
. This leaves only about
percent that is freshwater for meeting the needs of people,
and animals. This is why there is such concern for protection this rare and
resource. Unfortunately, only about a third of our freshwater is even
for us to use. The rest is
solid in glaciers, in the snow on high mountaintops and in the
ice caps. So the end result is that we have only about
percent of all the water on Earth that we can use.
Check
OK