Question

the pictures show the appalachian mountains and the rocky mountains.
appalachian mountains - geologically old
highest point - 2037 m
rocky mountains - geologically young
highest point - 4399 m
what caused the shape and height difference between the appalachian and rocky mountains?
a. millions of years of weathering and erosion
b. millions of years of earthquakes and aftershocks
c. millions of years of deposition and sedimentation
d. millions of years of volcanic activity and outgassing

Explanation:

The Appalachian Mountains are geologically old, so they have been exposed to weathering (like wind, water, ice breaking down rocks) and erosion (transporting broken - down materials) for millions of years. This process wears down the mountains, making them shorter and more rounded in shape. The Rocky Mountains are geologically young, so they haven't been subjected to as much weathering and erosion, so they are taller and more rugged. Earthquakes (option B) don't primarily shape mountain height and general shape over millions of years in this way. Deposition and sedimentation (option C) build up landforms, not wear down old mountains. Volcanic activity (option D) is not the main factor for the difference between these two mountain ranges' shape and height.

Answer:

A. millions of years of weathering and erosion