| Questions | |
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| One of our most important sources of freshwater and a key component of the earth’s natural capital. | |
| Spaces below the surface that are filled with water. (Three words) | |
| The top of the groundwater zone. (Two words) | |
| Underground caverns and porous layers of sand, gravel, or through which groundwater flows. | |
| When aquifers are replenished naturally by precipitation that percolates downward through exposed soil and rock. (Two words) | |
| Aquifers can also be recharged from lakes, rivers, and streams. (Two words) | |
| These get very little recharge because they are found deep underground and were formed tens of thousands of years ago. (Two words) | |
| The freshwater from precipitation and melted snow that flows actross the eath’s land surface and into lakes, wetlands, streams, estuaries, and into the oceans. (Two words) | |
| | Questions | |
|---|
| Precipitation that does not infiltrate the ground or return to the atmosphere. (Two words) | |
| Where surface water drains, also known as drainage basin. | |
| We can generally count on as a source of freshwater from year to year. (Two words) | |
| A prolonged period in which precipitation is at least 70% lower than average and evaporation is higher than normal. | |
| Involves removing dissolved salts from ocean water or from brackish water in aquifers or lakes. | |
| Heating saltwater until it evaporates and condenses as fresh water. | |
| Uses high pressure to force saltwater through a membrane filter with pores small enough to remove the salt. (Two words) | |
| The area where overflowed water goes after a flood. | |
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The Nine Planets 
Digits of Pi 
Multiplication Table
