ответить на вопросы ! 1)what countries does the usa border on? 2)what mountains chains in the usa do you know? 3)where are the great lakes situated? 4)what is the largest river in the country? 5)does the colorado flow north or south? 6)what is death valley famous for? 7)why do so many people want to see the grand canyon? 8)what is the name of the famous waterfall in the usa? 9)where ate the great plains situated? 10)can you name two places os interest in washington?