单词	tephra
释义	tephra /ˈtɛfrə / noun [mass noun] Geology Rock fragments and particles ejected by a volcanic eruption.Any such lateral motions could contribute to the absence or thinness of distal marine tephra layers on submarine high points or steep slopes.... Two types of tephra fallout deposits have been observed. Some reports are stating that that tephra rim could collapse later this year. Origin 1940s: from Greek, literally 'ash, ashes'.
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