Here's a few: Gold, Titanium, Zicronium, Cement, and Soda Ash.
Answer: They are younger than the Appalachian mountains
They are taller than the Appalachian mountains
Explanation:
The Appalachian mountains highest peak is about 6,684 feet while the Rocky mountains highest peak is 14,440 feet
The Appalachian mountains are 480 million years old while the Rocky mountains are only about 300 million years old
Most plants live in the Epipalegic zone so your answer would be A
