abstract
asphalt
colourful
conservation
damage
danger
dirty
disaster
ecology
fluid
fuel
gas
gasoline
grunge
industrial
industry
inflammation
leak
leaking
liquid
motor
oil
paint
petrol
petroleum
poison
polluted
pollution
power
product
rain
rainbow
reflection
rough
slick
spectrum
spill
splash
spot
stain
surface
textured
tile
traffic
transport
wet