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stop being frozen as conditions warm
解冻；融化
periodic change in sea level mainly caused by gravitational forces
潮汐
harmful because it can poison organisms
有毒的
large waves caused by sudden displacement of water
海啸
movement of deeper water toward the ocean surface
上升流；深层海水上涌
produced by or associated with volcanoes
火山的；由火山活动形成的
water left after domestic, industrial, or other use
废水；污水
circulation of water among the atmosphere, land, and oceans
水循环
lack of enough available water to meet demand
水资源短缺
level marking the top of the saturated groundwater zone
地下水位；潜水面
land area whose water drains toward the same outlet
流域；集水区
atmospheric conditions at a particular place and time
天气
physical or chemical breakdown of rock without its transport
风化作用
unplanned fire spreading through wild vegetation
野火；林地或草地火灾
speed at which air moves past a point
风速