Lesson 42 Recording an earthquake
时间:2005-10-2 0:00:13 作者:alex
鍙彲鑻辫-骞磋交浜虹殑鑻辫鍚璁粌骞冲彴
Lesson 42 Recording an earthquake
slowly and arrive several
minutes after the first. These two have travelled through the earth. It was from the study of these that so much
was learnt about the interior of the earth. The third, or main wave, is the slowest and has travelled round the
earth through the surface rocks.
slowly and arrive several
minutes after the first. These two have travelled through the earth. It was from the study of these that so much
was learnt about the interior of the earth. The third, or main wave, is the slowest and has travelled round the
earth through the surface rocks.
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