Why do grasslands occur in the interiors of continents?
What will be an ideal response?
Grasslands occur primarily in the interiors of continents in areas that are too moist for deserts to form and too dry for forests to grow. Grasslands persist because of a combination of seasonal drought, grazing by large herbivores, and occasional fires-all of which keep shrubs and trees from growing in large numbers.
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Explain the formation of a geostrophic wind.
What will be an ideal response?
Why is carbon better than lead as a moderator in nuclear reactors?
A) Carbon produces the high energy, high speed neutrons necessary for maintaining the nuclear chain reaction. B) Carbon slows down the neutrons making them more effective in stimulating the nuclear chain reaction. C) Lead absorbs the neutrons rather than allowing them to rebound to maintain the nuclear chain reaction. D) Lead slows down the neutrons making them less effective in stimulating the nuclear chain reaction.
Fractures in bedrock along which movement has taken place are called
A. folds B. joints C. faults D. cracks
The theory of ________ states that at times in the past, colder climates prevailed during which much more of the land surface was glaciated than at present time.
A. climate change B. Vostock C. Milankovitch D. ice accumulation E. glacial ages