首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Every geologist is familiar with the erosion cycle. No sooner has an area of land been raised alive sea-level than it becomes s
Every geologist is familiar with the erosion cycle. No sooner has an area of land been raised alive sea-level than it becomes s
admin
2013-11-29
80
问题
Every geologist is familiar with the erosion cycle. No sooner has an area of land been raised alive sea-level than it becomes subject to the erosive forces of nature. The rain beats down on the ground and washed【51】the finer particles, sweeping them into rivulets and then into rivers and out to sea. The frost freezes the rain water in cracks of the rocks and breaks【52】even the hardest of the constituents of the earth’s crust. Blocks of rock dislodged at high levels are brought down by the force of gravity. Alternate heating and【53】of bare rock surfaces causes their disintegration. In the dry regions of the world the wind is a powerful force in removing material from one area to another. All this is natural. But nature has also provided certain defensive forces. Bare rock surfaces are in【54】course protected by soil itself dependent initially on the weathering of the rocks. Slowly【55】surely, different types of soil with differing "profiles" evolve the main types depending primarily on the climate. The protective soil covering, once it is formed, is held together by the growth of vegetation. Grass and herbaceous plants,【56】long, branching tenuous roots, hold firmly together the surface particles. The【57】is true with the forest cover. The heaviest tropical down- pours beating on the leave of the giant trees reach the ground only【58】spray, gently watering the surface layers and penetrating along the long passages provided by the roots to the lower levels of the soil. The soil, thus protected by grass, herb, or trees, furnishes a quiet habitat for a myriad varied organisms-earth-worms that importantly modify the soil, bacteria, active in their work of converting【59】leaves and decaying vegetation into humus and food for the growing plants. Chemical action is constantly taking【60】. Soil acids attack mineral particles and salts in solution move from one layer in the soil to another.
选项
答案
in
解析
意思为“仅仅以水花的形式落在地面”。
转载请注明原文地址:https://kaotiyun.com/show/PmhO777K
0
考博英语
相关试题推荐
Inthepastoysterswereraisedinmuchthesamewayasdirtfarmersraisedtomatoes-bytransplantingthem.First,farmersselect
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.Thesamecommentis【52】fromgenerationtogenerationan
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.Thesamecommentis【52】fromgenerationtogenerationan
Oldpeoplearealwayssayingthattheyoungpeoplearenot【51】theywere.Thesamecommentis【52】fromgenerationtogenerationan
Aboutadecadeago,then-RepublicanHouseleaderNewtGingrichraisedabigstirwhenheimpliedthatamother’sdrowningofher
MenhaveoftenbeenpraisedbybeingtoldthattheywereassmartasaPhiladelphialawyer.Nooneknowswhythereissomething
Stratford-on-Avon,asweallknow,hasonlyoneindustry—WilliamShakespeare—buttherearetwodistinctlyseparateandincre
Theevolutionofsexratioshasproduced,inmostplantsandanimalswithseparatesexes,approximatelyequalnumbersofmalesa
Stratford-on-Avon,asweallknow,hasonlyoneindustry--WilliamShakespeare--buttherearetwodistinctlyseparateandincreas
随机试题
关于化脓性关节炎浆液纤维素渗出期的叙述正确的是()
A.50ml以上B.40ml以上C.30ml以上D.20ml以上E.10ml以上成人烧伤后,治疗过程中要求其每小时尿量保证在
对毛果芸香碱叙述错误的是
A、脓血便B、柏油样便C、白陶土便D、稀糊便E、细条样便食管胃底静脉曲张破裂出血()。
会计凭证的传递是指会计凭证从取得或填制时起至归档保管时止,在单位内部会计部门和人员之间的传送程序。()
相对定期预算而言,下列各项中,不属于滚动预算的优点的是()。
环形跑道的周长为400米,甲乙两人骑车同时从同一地点出发,匀速相向而行,16秒后甲乙相遇。相遇后,乙立即调头,6分40秒后甲第一次追上乙,问甲追上乙的地点距原来的起点多少米?()
多一些空间来包容各色人等的自由言说,也更容易化牢骚为高见。记得科恩在《论民主》中说过:“对建议自由的任何限制,不仅是对建议者的限制,也是对社会成员的限制,因为这样就阻止了他们考虑该项建议。由于这种限制,所有成员参与的深度就为之降低。”其实要提升公民参与的深
DawnaWalterisoneoftheauthorsleadingthewayinBritainwithherbookthatattemptstohowevenatidy【M1】______
HundredsofthousandsofillegalimmigrantswhocametotheUnitedStatesaschildrenwillbeallowedtoremaininthecountryw
最新回复
(
0
)