首页
登录
职称英语
Australia is【21】driest continent in this world. The evaporation rate of rain
Australia is【21】driest continent in this world. The evaporation rate of rain
游客
2024-08-13
49
管理
问题
Australia is【21】driest continent in this world. The evaporation rate of rainfall in Australia is【22】.
The reason for rapid drying-up of water and bare penetrating of the soil of rainfall is that the moisture is absorbed by.【23】
In sandy soils rainwater can【24】
Water is mainly pumped up for【25】
Natural springs are located in some parts【26】
Underground water supplies about 18% of the【27】
The dams store water for a variety of functions:
the rural irrigation【28】
the regulation【29】
the generation【30】 [br]
Good morning. This morning we are continuing our look at Australia and its natural problems. Actually dryness, or aridity, as it is generally called by geographers, is probably the most challenging of Australia’s natural problems and so it is very important in this course for you to have a good understanding of the subject. For Australia, water is a precious resource and its wise management is of the greatest importance.
As I have said, Australia is a dry continent, second only to Antarctica in its lack of rainfall. Long hours of hot sunshine and searing winds give Australia an extremely high rate of evaporation, far more than in most other countries. It is estimated that approximately 87% of Australia’s rainfall is lost through evaporation, compared with just over 60% in Europe and Africa and 48% in North America. You generally think of many parts of Australia standing water, that is dams, puddles and so forth, dry up rapidly and some rainfall barely penetrates the soil. The reason for this is that thirsty plants absorb the moisture.
Some parts of Australia are dry because rainwater seeps quickly through sandy soil and into the rock below. In parts of Australia this water, which seeps through the sandy soils collects underground to form underground lakes. Water from these subterranean lakes can be pumped to the surface and lapped and so used for various purposes above the ground. In fact, extensive underground water is too salty to be used for human consumption or for the irrigation of crops. However, most inland farmers do rely on this water for watering their animal and, where possible, to a lesser extent for irrigation.
Underground water can flow very large distances and can be kept in underground reservoirs for a very long time. Water from these underground bubbles to the surface as springs in some parts of the country, and there rare sources of permanent water were vital to early explorers of island Australia, and to other pioneers last century, who used the springs for survival. But in many places levels have fallen drastically through continuous use over the year. This has necessitated the pumping of the water to the surface. Remarkably, underground water sources in Australia supply about 18% of total water consumption. So you can see it is quite an important source of water in this dry land.
So most of the consumption of water in Australia comes from water which is kept above ground. More than 300 dams regulate river flows around the country. The dams store water for a variety of function, the rural irrigation of crops, without which many productive areas of the country would not be able to be farmed ; the regulation of flooding, a serious problem which will be dealt with later in the course; and last but not least, the harnessing of the force of gravity for the generation of electricity. That is all we have for this morning, but you will be able to do further study on this important area in the interested, please come up to the desk and take a copy.
选项
答案
their animals
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3717726.html
相关试题推荐
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
Australiais【21】driestcontinentinthisworld.Theevaporationrateofrain
______issometimescalled"theworld’sbiggestfarm".A、NewZealandB、Australia
TheAustralianfederationhasa______systemofgovernment.A、two-tierB、three-t
Australiaisthe______largestcountryintheworld.A、fourthB、fifthC、sixthD、
TheAustralianfederationhasa______systemofgovernment.A、two-tierB、three-tie
随机试题
Themunicipalplanningcommissionsaidthattheirfinancialoutlookforthenext
Completetheformbelow.WriteONEWORDAND/ORANUMBERforeachanswer.FruitP
Smokingcigarettesaddstothegenerallevelsofairpollutionaswellasdamagi
【S1】[br]【S7】B此处需要作定语的形容词,根据题意有current和individual都合乎题意,但是第56题只能填current,所以这里填in
对急诊患者,当手术是抢救患者的唯一方案时,最符合医学道德的做法是A.在征得其家属
下列汽车库的耐火等级不应低于一级的有()。A.某停车数量为120辆的地上汽
工作岗位横向分类的程序包括:①职组的划分;②职门的划分;③职系的划分。排序正确的
阳明潮热的时间是( ) A.11~13时 B.13~15时 C.15—1
( )的变化趋势引导着一个国家利率的总体变化方向。A.基础利率 B.基准利率
共用题干 2011年7月5日,某公司高经理与员工在饭店喝酒聚餐后表示:别开车了
最新回复
(
0
)