upwellings of magma began to lift the seafloor... 岩浆喷发开始抬高海床
The Californian upwellings are seasonal and relatively small 加利福尼亚寒流是季节性洋流,相对较小.
These upwellings fertilize forests of giant kelp, that thrive in the summer sunshine. 这种上升洋流给巨藻带来了大量养分 在夏日阳光照射下它们飞速生长