Describe the physical processes that result in the summer and winter stratification in temperate ...

Answer to q. 1

Concepts to Consider: During the summer, the water above the thermocline is warmer (and
less dense) than the bottom waters, setting up summer stratification; during the cooling in the
fall, the thermocline disappears and the lake will mix from top to bottom; during the winter,
the lake cools and ice may form at the top, effectively insulating the lake from further cooling
(organisms living below the ice experience temperatures ranging from 0 C to 4 C, but do
not freeze); the spring turnover occurs after the ice melts and mixing again occurs; summer
stratification follows.

Answer to q. 2

Concepts to Consider: Tundra--oil exploration and military use; taiga--clear-cut logging;
temperate rain forest--logging; temperate deciduous forest--logging and agricultural use;
temperate grasslands--agriculture; chaparral--fire control, development; desert--recreational
uses, groundwater use; savanna--agriculture (rangeland); tropical forest--logging, agriculture