火山爆發是因為平時岩漿就被地殼給包住,由於地球內部溫度很高,岩漿無法安安靜靜的待著,於是就不停找出口想跑出去。不過地下的壓力很大,岩漿要跑出去也不是很容易。( K" u1 }- {" O5 E" b- Y
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岩漿一直等待機會要出來,一旦當它衝到地殼較脆弱的地方時,或是地殼某處又裂縫的區域,它的壓力就會減輕不少。不過,這時岩漿中的氣體及水汽卻活躍了起來,不斷用力推動岩漿衝向地面。當岩漿衝出地面時,本來被擠壓在裡面的氣體和水汽便立刻膨脹,威力強大的火山爆發,就這麼開始了。2 h: H# |* X7 M
I don't think I will take pictures like this by myself. + v2 w, I( R* G0 y5.39.217.76It is too hot and danger to do so.5.39.217.76; V" d# q6 l4 l/ f: u
Nice shot.公仔箱論壇, F( C M& Z9 F. P* X2 c* N; X7 |, Y+ ^
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Very nice photos.tvb now,tvbnow,bttvb# n8 A$ z" e1 k" @) V' `1 Q: A
But it kill people.) V: G) f8 C. O1 d9 Q
Hope they can survive. Some people have no choice to live there. d- ?# ]% p9 F公仔箱論壇Thanks