首页
登录
职称英语
What happens to trees each year? [br] [originaltext] During this century, a
What happens to trees each year? [br] [originaltext] During this century, a
游客
2023-11-14
45
管理
问题
What happens to trees each year? [br]
During this century, archaeologists have discovered that the trees can be a valuable tool for measuring time. In scientific terms, this method is called dendrochronology. Dendrochronology is based on the scientific discovery that each year a tree grows a new layer of wood. When you cut down a tree, for example, you can see and count the layers of concentric circles. These circles will reveal a great deal of information. The layers vary in color and in thickness. These variations are a result of differing climate conditions from year to year that affect the growth of the annual rings. Cold weather, for example, creates thinner and lighter rings while hot weather produces thicker and darker rings. All trees that grow in the same region will have roughly the same pattern of annual rings, and this can be used as a source of comparison and measurement.
Early in this century, archaeologists began using the rings to date ruined structures and figures built in the southwestern United States. They did this by comparing the rings of the wood found in the ruins with the rings of recently cut trees. Slowly but surely, the system was extended backwards in time to measure older ruins. The heavy forestry of the United States, coupled with the relative youth. Of its history, led to a fairly uncomplicated study. Eventually, dendrochronology produced an accurate time and weather record for the American southwest that extended over 2,000 years.
选项
A、The climate.
B、The exposure to light.
C、The length of time.
D、The fertility of the soil.
答案
A
解析
原文中有“These variations are a result of differing climate conditions from year to year that affect the growth of the annual rings.”一句。
转载请注明原文地址:https://tihaiku.com/zcyy/3187207.html
相关试题推荐
Theaccidentwasreportedtohaveoccurred[br][originaltext]Anaircraftca
Theaccidentwasreportedtohaveoccurred[originaltext]Anaircraftcarrying
Themainaimofthespeakeristo[br][originaltext]Alotofpeopledon’t
Whatisthespeaker’sfieldofstudy?[br][originaltext]I’mcurrentlyst
Whatistheprofessormainlydiscussing?[br][originaltext]Good’afternoo
Whatistheprofessormainlydiscussing?[br][originaltext]Good’afternoo
WhydidthewomangotoHongKong?[br][originaltext]M:Hi,Maggie!Haven’tse
Bytheendofthiscenturyintelligentrobot______todomostofthehousework
Whenwasthepaintbrushfirstutilized?[br][originaltext]Anancientpain
Whenwasthepaintbrushfirstutilized?[originaltext]Anancientpaintbrush
随机试题
在中国,年轻人有了全新的消费习惯,线上线下销售渠道覆盖了全国各地。InChina,youngpeoplehavebrand-newconsumpti
Hotelsandrestaurantsarean________partofthecity,withoutwhichthetourist
Wisebuyingisapositivewayinwhichyoucanmakeyourmoneygofurther.T
关于药物的治疗作用,正确的是A.与用药目的无关的作用 B.只改善症状,不是治疗
甲公司2011年度财务报告批准报出日为2012年3月30日,以下属于资产负债表日
(2018年真题)外审机构存在下列()情况之一的,银行不宜委托其从事外部审计业
房屋所有权自()后产生效力。A.行为事件发生 B.所有权转移手续办理完毕
可以相互调配负载的变压器,应考虑合理分配负载,使总损耗()。(A)不变(B)
十八大以来,兵团各级紧紧抓住经济换挡升级的有利时机,有力地推动了商贸规模持续扩大
一般情况下,可以作为天然地基的填土有( )。A.堆填超过10年的黏性土 B.
最新回复
(
0
)