africa
african
background
barrel
biochemical
biohazard
blob
border
business
can
cargo
catastrophe
chemical
container
contour
country
crisis
danger
dangerous
disaster
drilling
drop
environment
environmental
hazard
hazardous
industrial
industry
leak
liquid
national
outline
poison
pollution
power
protection
radioactive
risk
safety
security
shape
sign
slick
spill
stain
storage
substance
symbol
tank
toxic