海底扩张 hǎi dǐ kuò zhāng

DEFINITIONS

  1. seafloor spreading (geology)

CHARACTERS

海 hǎi
HSK 4
sea, ocean; maritime
底 dǐ
HSK 4
bottom, underneath, underside
扩 kuò
HSK 5
expand, enlarge, stretch
张 zhāng
HSK 3
stretch, extend, expand; sheet