BRAINLIEST TO FIRST CORRECT
The Rocky Mountains begin forming in the Western United States about 60 million years ago. The Appalachian Mountains in the Rocky Mountains were similar and height when they first form. Which statements about the Rocky Mountains are true? Select the two correct answers.

They are older than the Appalachian Mountains
They are shorter than the Appalachian Mountains
They are younger than the Appalachian Mountains
They are taller than the Appalachian Mountains