action

activity

backhoe

big

bulldozer

construction

contractor

crawler

day

development

dig

digger

dirt

dump

earth

ecology

environment

equipment

excavate

excavation

exploitation

ground

heavy

industrial

industry

land

landscape

loader

machine

machinery

mechanical

mining

mover

nature

outdoors

road

sand

scoop

shovel

site

sky

soil

tractor

tree

truck

vehicle

work

working

yellow