首页
登录
职称英语
Even geologist is familiar with the erosion cycle. No sooner has an area of
Even geologist is familiar with the erosion cycle. No sooner has an area of
游客
2025-04-12
19
管理
问题
Even geologist is familiar with the erosion cycle. No sooner has an area of land been raised above sea-level than it becomes subject to the erosive forces of nature. The rain beats down on the ground and washed【R1】______the finer particles,sweeping them into rivulets and them into rivers and out to sea. The frost freezes the rain water in cracks of the rocks and breaks【R2】______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【R3】______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【R4】______course protected by soil,itself de-pendent initially on the weathering of the rocks. Slowly【R5】______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 hold together by the growth of vegetation. Grass and herbaceous plants, 【R6】______long,branching tenuous roots,hold firmly together the surface particles. The【R7】______is true with the forest cover. The heavi-est tropical downpours beating on the leaves of the giant trees reach the ground only【R8】______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【R9】______leaves and decaying vegetation into humus and food for the growing plants. Chemical action is con-stantly taking【R10】______;soil acids attack mineral particles and salts in solution move from one layer in the soil to another. [br] 【R2】
选项
答案
down
解析
break down的意思是“把……分解;精神崩溃”。空格处的意思是:严寒凝结了岩石缝隙里的雨水,即使是地壳最坚硬的外壳也被分解成碎块。
转载请注明原文地址:https://tihaiku.com/zcyy/4034158.html
相关试题推荐
Talkingaboutthatisuseless,______isfamiliartome.(四川大学2010年试题)A、whichfact
Over-cultivationandalongperiodofsoilerosionhasreducedthe______ofmuch
Tobefrank,I’dsooneryou______agoodreviewyesterdayforthecomingtest.A、h
Asisknowntoall,______commoditieswilldefinitelydoharmtoourlifesooner
Researcherswhoareunfamiliarwiththeculturalandethnicgroupstheyare
Researcherswhoareunfamiliarwiththeculturalandethnicgroupstheyare
Themostfamiliarheadachecomesfrom______tightnessintheback,headandneck,
Ifyouworkforamajorcorporation,orarecontractedatone,soonerorlater,you
Thefirstthingtonoticeisthatthemediawe’reallfamiliarwith—fromboo
Thefirstthingtonoticeisthatthemediawe’reallfamiliarwith—fromboo
随机试题
•Readthetextbelowaboutconsumerelectronicsmodel.•Inmostofthelines3
Choosethecorrectletter,A,BorC.[br]Theywanttodothisprojectbecause
[originaltext]M:I’mgoingtoBostonnextweekandI’dliketomakesomereserv
现阶段监管科技的运用主要集中于事中监管阶段,但各监管主体正在努力探索其在事前、事
关于正常胃的声像图表现,叙述错误的有()A.胃体部胃壁最厚 B.经体表超声可
法律形式又称( )。 A.法律规范 B.法律渊源 C.法律条文 D.法
行业分析的主要任务包括()。 A.预测并引导行业的未来发展趋势,判断行
以下买入股票、基金、权证的申报数量属于有效申报的有()。A:300股 B:1
影响某地区某一时期房地产供给量的因素包括()。A.房地产的价格水平 B.消费者
下列关于不可抗力的索赔,描述错误的是()。A.工程所需要的清理.修复费用,
最新回复
(
0
)