accumulate

animals

aquatic

background

bag

canal

contamination

damage

decaying

dirt

dirty

ditch

ecosystem

environment

floats

garbage

grass

green

harmful

issues

junk

life

litter

mixed

natural

nature

outdoor

park

plants

plastic

poison

polluted

pollution

pond

problem

puddle

reed

reflection

rubbish

sewage

slough

stains

surface

swamp

toxic

trash

unclean

waste

wastes

water