首页
登录
职称英语
A weather map is an important tool for geographers. A succession of three or
A weather map is an important tool for geographers. A succession of three or
游客
2023-09-01
27
管理
问题
A weather map is an important tool for geographers. A succession of three or four maps presents a continuous picture of weather changes. Weather forecasters are able to determine the speed of air masses and fronts; to deter mine whether an individual pressure area is deepening or becoming shallow and whether a front is increasing or decreasing in intensity. They are also able to determine whether an air mass is retaining its original characteristics or taking on those of the surface over which it is moving. Thus, a most significant function of the map is to reveal a synoptic picture of conditions in the atmosphere at a given time.
All students of geography should be able to interpret a weather. map accurately. Weather maps contain an enormous amount of information about weather conditions existing at the time of observation over a large geographical area. They reveal in a few minutes what otherwise would take hours to describe. The United States Weather Bureau issues information about approaching storms, floods, frosts, droughts, and all climatic conditions in general. Twice a ’month it issues a 30-day "outlook" which is a rough guide to weather conditions likely to occur over broad areas of the United States. These 30-day outlooks are based upon an analysis of the upper air levels which often set the stage for the development of air masses, fronts, and storms.
Considerable effort is being exerted today to achieve more accurate weather predictions. With the use of electronic instruments and earth satellites, enormous gains have taken place recently in identifying and tracking storms over regions which have but few meteorological stations. Extensive experiments are also in progress for weather modification studies. But the limitations of modification have prevented meteorological results except in the seeding of super-cooled, upslope mountainous winds which have produced ad ditional orographic (山岳形态的) precipitation (山岳雨) on the windward side of mountain ranges. Nevertheless, they have provided a clearer under standing of the fundamentals of weather elements. [br] The thirty-day forecast is determined by examining ______.
选项
A、daily weather maps
B、upper air levels
C、satellite reports
D、changing fronts
答案
B
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2977008.html
相关试题推荐
【B1】______[br]【B9】______[originaltext]OneofAmerica’smostimportant(26)
【B1】______[br]【B8】______[originaltext]OneofAmerica’smostimportant(26)
【B1】______[br]【B6】______[originaltext]OneofAmerica’smostimportant(26)
【B1】______[br]【B4】______[originaltext]OneofAmerica’smostimportant(26)
【B1】______[br]【B3】______[originaltext]OneofAmerica’smostimportant(26)
【B1】______[br]【B2】______[originaltext]OneofAmerica’smostimportant(26)
Agricultureisundoubtedlythemostimportantsectorintheeconomiesofm
Agricultureisundoubtedlythemostimportantsectorintheeconomiesofm
Agricultureisundoubtedlythemostimportantsectorintheeconomiesofm
Agricultureisundoubtedlythemostimportantsectorintheeconomiesofm
随机试题
[originaltext]Whenitcomestoaging,lifecanbecruel.There’splentyto
AnneCarson’sbookNoxis,verydeliberately,________literaryobject梩heopposi
[originaltext]JoeSmithhadbeenbroughtupinanorphanage.Heenviedpeop
StudentswhowanttostudyintheUnitedStatesmayfindthattheirchances
Facebook’sSystemofDis
如果被用工者的行为造成了损害,但是存在法定的免责事由,则不构成用人责任。( )
Thechangeinthatvillagewasmiraculou
禁止阻塞线采用45黄色与黑色相间的等宽条纹,宽度宜为50~150mm,长度不小于
在消防给水系统中,灭火时启动消防泵,使管网中最不利处消防用水点的水压和流量达到灭
低档品价格上升导致需求下降的主要原因是( )。A.替代效应与价格呈反方向变动,
最新回复
(
0
)