At the end of the Permian period the earth's landmasses were configured into one supercontinent, Pangea, and a superocean, Panthalassa.
二叠纪末期,地球上的陆地合并成一块超级
,
盘古
陆,以及一个超级
,
原始
洋。
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Major types include stratovolcanoes which often appear as tall steep mountains, shield volcanoes which are flatter and dome-shaped, calderas which are large depressions in the ground and mid-ocean ridges which are underwater chains of volcanic mountains.
层状火山,通常看起来像陡峭的高山;盾状火山,平坦呈圆顶状;火山口,地面上的
洼地;
洋中脊,海底的火山山脉。
.第三册
自然在说话
力全真试题 5