| 单词 | megaplume | 
| 释义 | > as lemmasmegaplume   megaplume  n.  Brit. , U.S. a large thermal plume, spec. a short-lived, massive hydrothermal plume. ΚΠ 1973    Nature 31 Aug. 566/2  				Broad thermal highs, or megaplumes, with horizontal dimensions measurable in hundreds of km, lay beneath the crust and remained active over long periods. 1989    Jrnl. Geophysical Res. B. 94 12232/1  				A steady state black smoker flow can be periodically interrupted by outbursts of very rapid flow, giving rise to a normal hydrothermal plume with periodic megaplumes rising through and above it. < as lemmas | 
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