abstract
andalusia
blue
brown
colorful
copper
copper deposit
creek
ecology
environment
environmental pollution
europe
excavation
huelva province
iron
iron deposit
iron ore
minas de rio tinto
mine
mineral
mining
nature
orange
oxidization
oxidized
pattern
pebble
poisonous
pollution
purple
red
rio tinto
river
riverbed
rock
rustcolored
sludge
spain
stone
teture
water
yellow