首页
登录
职称英语
What happens during the natural growth of a tree each year? [br] [originaltext]
What happens during the natural growth of a tree each year? [br] [originaltext]
游客
2023-11-07
24
管理
问题
What happens during the natural growth of a tree each year? [br]
During this century, archaeologists have discovered that 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. The layers vary in color and in thickness. These variations are a result of differing climate conditions from year to year that affects 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.
选项
A、The weather.
B、The exposure to sunlight.
C、The nutrition provided by the soil.
D、The time span.
答案
A
解析
细节题。文章说到树木的年轮圈各不相同,主要是由于不同的气候条件会影响每个年轮圈的生长。故选项A是正确的。
转载请注明原文地址:https://tihaiku.com/zcyy/3167175.html
相关试题推荐
Thespeakermainlydiscusses______.[br][originaltext]Intheearly1800s
Thespeakermainlydiscusses______.[br][originaltext]Intheearly1800s
Whatdopeopleknowaboutearlydolls?[br][originaltext]Nobodycanever
WhatwassaltusedtodoinEgyptthousandsofyearsago?[br][originaltext]
WhatwassaltusedtodoinEgyptthousandsofyearsago?[br][originaltext]
WhatwassaltusedtodoinEgyptthousandsofyearsago?[originaltext]Weh
WhereisthetownofSanJuanCapistrano?[originaltext]M:So,Rebecca,whatdid
WhoistrueofLisa?[br][originaltext]Sally:Now,specificallyinthatseng,
WhoistrueofLisa?[originaltext]Sally:Now,specificallyinthatseng,youme
WhydoesthemanwanttovisitNewMexico?[br][originaltext]M:(1)I’vebeen
随机试题
Overthepastdecade,manycompanieshadperfectedtheartofcreatingautom
TheheadoftheexecutivebranchinNewZealandisA、thePresident.B、theGoverno
某些程序设计语言中,在运行过程中当一个对象发送消息请求服务时,根据接收对象的具体
Thechangeinthatvillagewasmiraculou
pH敏感靶向制剂属于A.前体药物 B.主动靶向制剂 C.被动靶向制剂 D.
初产妇26岁,妊娠40周,宫口开全,胎头拨露已1.5小时无进展,胎心率为150次
一般来说,CO2/CO为以下()判断为固体绝缘老化。(A)3(B)9(C
个案工作服务中,评估常采用的方法包括()。A.由社会工作同行评估服务工作的开展
在进行股指期现套利时,套利应该()。A.在期指处于无套利区间的上界之上进行正向
经过银行存款余额调节表调节后的存款余额,是企业可动用的银行存款实有数。()
最新回复
(
0
)