機器
environmental
canyon
chalk
chalkquarry
construct
construction
day
deposit
development
dig
dirt
dragline
earth
earthmover
equipment
excavation
excavator
expand
extract
extraction
geology
gravel
ground
heavy
industrial
industry
landscape
machinery
mine
mineral
mining
mountain
open
ore
pile
pit
pour
quarry
resource
rock
soil
stone
summer
tranquil
vehicle
walk
work