environmental
blue
bucket
calx
canyon
chalk
clear
day
deposit
dig
dirt
disk
dragline
earth
earthmover
environment
equipment
excavator
extract
extraction
gravel
heavy
hoist
industrial
industry
landscape
limestone
machinery
mine
mineral
mining
mountain
natural
old
operate
pile
pit
quarry
rock
sky
stone
summer
sun
sunny
walking
work