【題目】讀經(jīng)緯網(wǎng)示意圖.完成下列內(nèi)容。
(1)寫(xiě)出A、D兩點(diǎn)的經(jīng)緯度。
A(_________,__________);
D(_________,_________ )。
(2)判斷B、C兩點(diǎn)的半球位置。
從南、北半球看,B點(diǎn)位于_________半球;
從南、北半球看,C點(diǎn)位于_________半球。
(3)A點(diǎn)在C點(diǎn)的___________方向。
【答案】
(1)A(40°W,40°N) B(0°,20°E)
(2)北,南
(3)正北
【解析】
試題分析:
(1)在經(jīng)緯網(wǎng)上,經(jīng)線的度數(shù)叫做經(jīng)度,若相鄰兩條經(jīng)線的經(jīng)度向東增大,就是東經(jīng),用符號(hào)E表示,若相鄰兩條經(jīng)線的經(jīng)度向西增大,就是西經(jīng),用符號(hào)W表示;緯線的度數(shù)叫緯度,若相鄰兩條緯線的緯度向北增大,就是北緯,用符號(hào)N表示,若相鄰兩條緯線的緯度向南增大,就是南緯,用符號(hào)S表示。據(jù)圖可知:A點(diǎn)的坐標(biāo)是(40°W,40°N); D點(diǎn)的坐標(biāo)是(0°,20°E)。
(2)我們以赤道為界將地球劃分為南北半球,赤道以北為北半球,以南為南半球;以20°W和160°E組成的經(jīng)線圈為界將地球劃分為東西半球,20°W以東、160°E以西為東半球,20°W以西、160°E以東為西半球。據(jù)圖可知:從南、北半球看,B點(diǎn)位于北半球,C點(diǎn)位于南半球。
(3)地圖上定向的方法很多,對(duì)于一般地圖,通常是面對(duì)地圖“上北下南,左西右東”;有指向標(biāo)的地圖,根據(jù)指向標(biāo)定向,一般來(lái)說(shuō),指向標(biāo)箭頭指向北方;有經(jīng)緯網(wǎng)的地圖,根據(jù)“經(jīng)線指示南北方向,緯線指示東西方向”來(lái)確定方向。據(jù)圖可知:A點(diǎn)在C點(diǎn)的正北方向。
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