8.8: Earth's Fresh Water- Challenge 1
- Page ID
- 5446
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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