aquifer
black
carbon
data
drill
drilling
earth
energy
engineer
engineering
equipment
field
fossil
fuel
gas
gear
geological
geologist
geology
geophysics
hydro
hydrogeologist
icon
illustration
industrial
industry
line
logging
machinery
man
mechanical
men
mining
oil
outline
petroleum
pipe
recharge
sign
soil
symbol
team
teamwork
tool
tools
tower
well
worker
working