Water, Water, Everywhere.

Gap-fill exercise

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
One of the most common containing is good old water, .
is the chemical formula for it means that every molecule of water has two atoms of hydrogen and one atom of oxygen.
the on the Earth is called the .
Seven of water are the , saltwater seas and , rivers, freshwater lakes, the atmosphere, , and in glaciers and ice caps.
Oceans cover between 70 and of our planet
The oceans are the Pacific, , Indian, Arctic, and the .
One giant ocean, sometimes referred to as the .
are scientists who study the oceans.
Oceans contain about of all the Earth’s water.
Ocean water has a of .
The of the ocean, they are referring to the of salt in the ocean, but also other dissolved solids in the water
of all the water on Earth be easily used by .
Sodium chloride, , or ordinary table salt.
Only of the Earth’s water is .
About 2/3 of that 3% or of the world’s is in glaciers and ice caps at the North and South Poles.
are like huge that are slowly moving downhill or down the side of a mountain.
About 33% of the world’s freshwater or , is by mankind.
of the freshwater by mankind is found underground in .
About of the world’s freshwater is in .
Only about of all the water on Earth is by mankind.
is water stored in huge areas of permeable rock and sand called .
rock has or pores in it that can hold water
of soil above an aquifer out pollution.
and families usually get their water from drilled down into the
Cities also get some of their water from rivers and called .
is the process of from ocean water, making it drinkable.