The group that lists all the adjectives in the given sentence above is: Western, rattlesnake. An adjective is a word or words that describe a noun. These are called descriptive words. The word Western describes the noun towns. Whereas, the word rattlesnake describes the word roundups.
made of deeds of great valor or requiring superhuman courage.
I don't think that this classifies as an English question but I'll try to answer it. I think some of the causes are factories, where they can cause air pollution. Results would be the harming of our environment, global warming, and damage of historical monuments. I hope this helps. Next time try to post a question in the correct category. Have a nice day.