Thus while the upper surface of an oceanic plate is a crystalline solid , the underside exhibits a gradual phase change, from solid to plastic to viscous liquid as the temperatures and pressures increase with depth.

 
  • 因此虽然一个洋壳的上部是晶体,下面却显示了逐步的变化,即当温度和压力随深度增加时,便从固体到可塑体再到粘滞的液体。
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