abdomen
belt
blue
cement
construction
conveyor
danger
diesel
dig
dredger
earth
equipment
excavation
excavator
gear
gravel
gravel pit
hoe
hydraulic
industrial
industry
large
loading
machinery
manufacturing
metal
mining
mover
pile
pit
quarries
rock
sand
sand pit
scoop
shovel
site
sky
stone
traffic
transportation
working
yellow