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Drought and Its Causes Vocabulary and Expressions deficiency humanitarian erosion paradoxically atmospheric
Drought and Its Causes Vocabulary and Expressions deficiency humanitarian erosion paradoxically atmospheric
admin
2018-06-10
32
问题
Drought and Its Causes
Vocabulary and Expressions
deficiency humanitarian erosion paradoxically
atmospheric prevalence adversely sunshade
migration exacerbate
When will a drought likely be declared?
Drought and Its Causes
Drought is an extended period when a region receives a deficiency in its water supply, whether atmospheric, surface or ground water. A drought can last for months or years, or may be declared after as few as 15 days. Generally, this occurs when a region receives consistently below average precipitation. It can have a substantial impact on the ecosystem and agriculture of the affected region. Although droughts can persist for several years, even a short, intense drought can cause significant damage and harm to the local economy. Prolonged droughts have caused mass migrations and humanitarian crises.
Generally, rainfall is related to the amount of water vapor carried by regional atmosphere, combined with the upward forcing of the air mass containing that water vapor. If these combined factors do not support precipitation volumes sufficient to reach the surface, the result is a drought. This can be triggered by high level of reflected sunlight and above average prevalence of high pressure systems, winds carrying continental, rather than oceanic air masses, and ridges of high pressure areas from behaviors which prevent or restrict the developing of thunderstorm activity or rainfall over one certain region. Oceanic and atmospheric weather cycles make drought a regular recurring feature of the Americas along the Midwest and Australia.
Human activity can directly trigger exacerbating factors such as over farming, excessive irrigation, deforestation, and erosion adversely impact the ability of the land to capture and hold water. While these tend to be relatively isolated in their scope, activities resulting in global climate change are expected to trigger droughts with a substantial impact on agriculture throughout the world, and especially in developing nations. Overall, global warming will result in increased world rainfall. Along with drought in some areas, flooding and erosion will increase in others. Paradoxically, some proposed solutions to global warming that focus on more active techniques, solar radiation management through the use of a space sunshade for one, may also carry with them increased chances of drought.
选项
A、When a drought lasts for months or years.
B、When a drought lasts for weeks or months.
C、When a drought lasts for 15 days.
D、When precipitation is consistently below average.
答案
D
解析
根据原文“A drought can…Generally,this occurs when a region receives consistently below average precipitation”判断,一个地区的降雨量连续低于平均值的时候可以宣布形成干旱了,故本题应该选D。
转载请注明原文地址:https://kaotiyun.com/show/gXrO777K
本试题收录于:
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