地理教師網之自然地理
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  • [自然地理] 水的力學性質 添加時間:2019-04-28 12:11:37 點擊次數:50人次好評次數:0人次

    內容簡介:我們經常可以看到,一些昆蟲能夠將身體或四肢平鋪在水面上前行。同時,如果我們有足夠的耐心,也可以將一枚密度遠大于水的硬幣輕輕地放置在水面之上。其實,這些現象都表明水有較大的表面張力...[ 閱讀全文 ]

  • [自然地理] 水的高熱容性 添加時間:2019-04-28 12:06:43 點擊次數:35人次好評次數:0人次

    內容簡介:當一個物質由于加載了微量熱量而升高一定溫度時,熱量與升溫幅度的比值就是熱容。當物質熔化(由固態變為液態)或氣化(由液態變為氣態)時,都要吸收熱量,相反,冷凝(由氣態變為液態)或凝...[ 閱讀全文 ]

  • [自然地理] 水的相變 添加時間:2019-04-28 11:59:44 點擊次數:23人次好評次數:0人次

    內容簡介:水有固、液、氣三種狀態,這三種狀態又稱為水的三相。從水的三相圖上可以看出,在一定溫度和壓力條件下,水的存在狀態可以發生改變,稱為相變。日常生活中,我們將0℃稱為水的冰點,低于這一溫...[ 閱讀全文 ]

  • [自然地理] 水的三態 添加時間:2019-04-28 11:53:02 點擊次數:20人次好評次數:0人次

    內容簡介:水與地球上的很多物質一樣,都有固態、液態和氣態三種物質存在形式。但與其它物質不同,水是自然界中唯一一種三態同時并存的物質。自然界中,高山頂部的積雪和極地的冰層都是固體狀態的水,海...[ 閱讀全文 ]

  • [自然地理] 太陽 添加時間:2018-07-31 08:25:40 點擊次數:2155人次好評次數:2人次

    內容簡介:太陽系的中心天體,是銀河系中一顆普通的恒星。通過對太陽光譜的分析得知,太陽的化學成分主要是氫(約占總質量的71%)、氦(約占總質量的27%),其它元素約占總質量的2...[ 閱讀全文 ]

  • [自然地理] 光球 添加時間:2018-07-31 08:21:04 點擊次數:2071人次好評次數:0人次

    內容簡介:我們平時所看到的非常耀眼的太陽圓面叫光球。它是太陽大氣的最低一層,即一般用白光所觀測到的太陽表面,厚度僅500公里左右。我們所接收到的太陽能量基本上是從光球發出來...[ 閱讀全文 ]

  • [自然地理] 色球 添加時間:2018-07-31 08:10:50 點擊次數:3233人次好評次數:0人次

    內容簡介:在光球外面有一層玫瑰紅色的太陽大氣稱為色球,它是太陽大氣的中間一層,介于光球和日冕之間。平時色球和日冕都淹沒在藍天之中不易看到,只有在日全食時才能看到它瑰麗的...[ 閱讀全文 ]

  • [自然地理] 日冕 添加時間:2018-07-31 08:08:43 點擊次數:2084人次好評次數:0人次

    內容簡介:從色球層的邊緣向外,延伸到幾個太陽半徑,甚至更遠處的太陽大氣最外層,叫做日冕。日冕是由非常稀薄的、完全處于電離狀態的等離子體組成,其中主要是質子,高度電離的離...[ 閱讀全文 ]

  • [自然地理] 半影月食 添加時間:2018-07-28 06:24:48 點擊次數:2043人次好評次數:0人次

    內容簡介:見月食。 半影月食是月亮環繞地球運行過程中,通過地球的半影內的一種特殊天象。 月球進入地球半影的天文現象,這時地球擋住了一部分太陽照向月球的光,月球看上去要比平時昏暗一些,如果使用...[ 閱讀全文 ]

  • [自然地理] 穹窿構造地貌 添加時間:2018-04-09 08:20:37 點擊次數:2741人次好評次數:4人次

    內容簡介:是發育在地臺蓋層上的背斜,形態大致呈圓形,中部呈穹窿狀。 規模巨大的穹窿構造通常是由于巖漿侵入或者方向直交的褶皺運動互相干擾而造成的。穹窿外部是沉積巖的蓋層,穹...[ 閱讀全文 ]

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