Simplify the following text for a Grade 11 native English-speaking person.
Original: The Aleutian Range , part of the Ring of Fire , includes many of Alaska 's volcanoes including Mount Katmai , Novarupta and the Valley of Ten Thousand Smokes , Mount Redoubt , Mount Iliamna , and Augustine Volcano .
Simplified: iSome of the bigger ones are Mount Katmai , Novarupta and the Valley of Ten Thousand Smokes , Mount Redoubt , Mount Iliamna , and Augustine Volcano .