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Natural Science Exam 2 Questions and Answers
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Natural Science Exam 2 Questions and Answers
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Natural Science Exam 2Water - Answer -most abundant substance on the SURFace of the planet
oceans cover 70% of the planets surface
Why is water important? - Answer --Maintains climate
-Dilutes pollutants
-Essential to ALL life
- Most living things are composed by water (weight)
Trees-60%
Most animals/humans 65-70%
Surface Tension - Answer --observed by the "skin" that forms on the surface of water due to molecular
bond (STICKINESS)
- water striders and spiders can travel on this
Capillarity - Answer -the ability of water to move upward against GRAVITY in small pores or tubes
ex: transpiration
, Solvent - Answer --Water DISSOLVES more compounds than any other liquid
- nutrients can be carried through tissues
-waste can be removed from systems
- water is easily polluted by water soluble wastes
ex: acids, salts, toxic metals
Coolant - Answer --a lot of energy required to change from one physical state to another
- allows water to store HEAT (heat capacity)
- when it does change, it removes heat and is cooled by EVAPORATION
ex: car engines/ thermoelectric power plants like coal and gas
Water expands upon freezing
-Water is less dense when frozen which is why ice floats
-Why is it important to aquatic life? - Answer -
What recreation does water provide humans?
End of Chapter 4 - Answer -swimming, boating, fishing etc...
hydrologic cycle - Answer -clouds form, precipitation, runoff, infiltration to ground water, accessed
through well, plant uptake, evaporation, transportation back to the beginning of clouds being formed
Water comes from two sources: Surface Water - Answer -water in streams, lakes, wetlands, and
reservoirs
-these bodies of water form from precipitation that doesn't infiltrate the ground or return to
atmosphere
watershed - Answer -when precipitation is "caught" in basins
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