blue
bright
chalk
chalkquarry
chalky
countryside
dig
earth
ecology
environment
excavation
excavator
extraction
factory
geological
geology
horizon
industrial
industry
landscape
large
left
lime
limestone
machinery
manufacturing
material
mine
mineral
mining
natural
nature
open
pile
pit
place
plant
quarry
resource
sky
stone
summer
surface
technology
waste
work