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| 本帖最後由 wiusog2007 於 2013-1-6 01:42 PM 編輯
齊塔人之聲2012年12月22日聊天問答
Is lava homogeneous, the same everywhere? Why should it be? Even the highly mobile atmosphere differs from place to place – being humid here, of a different density there, and carrying methane or CO2 in heavier quantities in yet another place. Lava is melted rock, and the rock qualities nearby affect what is in the lava as it melts and combines with the lava. Lava can get trapped in pockets under the crust, as the crust is not smooth underneath any more than it is smooth above the surface. There are mountains and valleys beneath the crust, where lava can flow slowly or get trapped. These scientists are not surprised by the quality of the lava off the Baja, they are shocked at the degree of activity along the San Andreas there! Are the plates moving? Mexico is being pulled by the bowing of the N American continent, and this is yet more proof. ... |
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