英文關鍵字
algae
bluff
boat
cave
cavern
clayish
cliff
cliffside
coast
coastal
coastline
crag
ecology
ecosystem
environment
environmental
excursion
formation
geological
geology
grotto
indented
inside
jagged
jaggy
jutted
jutting
layer
limestone
minerals
navigate
outcropping
outcrops
ridge
rock
rocks
rocky
sail
sailing
sea
sediment
sedimentary
shoreline
submerged
tour
trip
visiting
weathered
weathering