dirtied — Simple past tense and past participle of dirty.
poured — to send (a liquid, fluid, or anything in loose particles) flowing or falling, as from one container to another, or into, over, or on something: to pour a glass of milk; to pour water on a plant.
polluted — made unclean or impure; contaminated; tainted: swimming in polluted waters.
collected — An author's collected works or letters are all their works or letters published in one book or in a set of books.
combined — A combined effort or attack is made by two or more groups of people at the same time.
