Explain why the climate on the eastern side of the rocky mountains differs drastically from the climate on the western side?

they differ because they want to and GOD KNOWS WHY!! PLUSALL STUDENTS IN MR. RYAN CLASS why are you looking for answers in the internet when you can use your book. DUH! I HOPE THIS ANSWER SURELY HELPS YOU SPECIALLY 3RD PERIOD AND 4TH PERIOD HOBOS