8.8: Earth's Fresh Water- Challenge 1

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1. ___ time is the average amount of time a water molecule stays in a reservoir.: Residence

2. What percent of Earth's water is fresh water?: Approximately 3%

3. Water is a ___ molecule, or a molecule with a charge difference across the molecule.: polar

4. Water molecules contain two ___ atoms and one ___ atom.: hydrogen; oxygen

5. When water freezes and changes to its ___ state it expands, while most other substances contract.: solid

6. ___ is the state transition by which a substance changes from a solid to a gas without going through the liquid state.: Sublimation

7. Runoff is ___.: when water flows across Earth's surface

8. Precipitation is ___.: when water falls from clouds to Earth's surface

9. In which "flow-through pathway" does water travel through the finest soil pores?: Matrix flow

10. Precipitation is usually expressed in which units?: millimeters

11. Groundwater is pumped from a confined aquifer whose intergranular pressure ___.: increases, while the aquifer's pore water pressure decreases