The abyssal plain is a vast expanse of ocean that stretches from bottom of the continental slopes to the trench zones, where deep canyons like the Marianas Trench cut through the ocean floor.

 
  • 二氧化碳对生态系统是很重要的,然而并不是每个人都关心我们过快将二氧化碳释放的大气层。
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