Why did periods of glacial advance in higher latitudes of the Northern Hemisphere tend to occur with cooler summers, but not necessarily with cooler winters??
What will be the ideal response?
ANSWER: For snow to fall, the surface air temperature need only be near freezing. In fact, the heaviest snows generally occur when the air temperature is only slightly below freezing. The main factor in keeping the snow on the ground for an entire year is the air temperature in summer. Cooler summers, of course, produce less melting and a greater likelihood that the snow will exist (in certain areas) for a long time. Once the snow stays on the ground it produces even cooler summers by reflecting much of the sunlight that strikes the region.
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The purpose of the third prong on a common electric plug of an appliance is
A. to connect the appliance to zero ground potential. B. a substitute for a safety fuse. C. to provide an alternate live wire. D. to handle three-phase electricity.
Which of the following is not the name of a chemical family?
A) heavy metals B) transition metals C) alkali metals D) alkaline-earth metals E) noble gases
In the context of climate change, what is a forcing agent?
What will be an ideal response?
What is differential weathering?
A. at least two weathering processes at work B. distinct rock types weathering at different rates C. a single weathering process that has different results D. when weathering actually strengthens the rock E. variety of climate conditions affecting weathering