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
25
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
She______toherteacherforcomingtoschoollate.A、excusedB、apologizedC、par
[originaltext]Mostyoungwomenbelievetheywillachieveabalancebetween
Alltheusefulenergyatthesurfaceoftheearthcomesfromtheactivityof
StoryTellingI.StatusofstorytellingA.Inthe
骑士传奇的三个系统是()A.不列颠系统 B.拜占庭系统 C.古代系统 D.
财政政策的手段包括( )。 Ⅰ.外汇储备 Ⅱ.转移支付 Ⅲ.国家预算
A.IgP B.结构非特异性药物 C.pH D.药效构象 E.结构特异性
赠与行为是A.单方法律行为 B.双方法律行为 C.单务法律行为 D.双务法
(2017年真题)担保活动应遵循的原则主要有()。A.平等 B.自愿
【病例摘要】 患者男性,56岁。 主诉:心悸、乏力2个月。 病史:患者于2
最新回复
(
0
)