| A | B |
|---|
| aquifer | an underground layer of rock that contains water |
| aquifer | rural communities drill wells to get their water from these |
| desalination | process of removing salt from ocean water to make it drinkable |
| freshwater | 3% of all water on Earth |
| glaciers and ice caps | contain 2/3rds of all freshwater |
| groundwater | about 1/3rd of the freshwater |
| glacier | slow moving river of ice |
| hydrosphere | all the water on the Earth |
| oceanographer | scientist who studies the oceans |
| one percent | the amount of all the water on Earth useable by mankind |
| permeable | rock that has spaces where water can be stored |
| reservoir | a large lake used by cities to store drinking water |
| salinity | the amount of salt in saltwater |
| water | covers about 75% of the Earth |
| world ocean | the one giant ocean that covers the Earth |
| NaCl | scientific name for salt found in oceans |
| 3.5% | the salinity of ocean water |
