Answer:
The answer to this question is D.
Explanation:
The Appalachians are among the oldest mountains on Earth, born of powerful upheavals within the terrestrial crust and sculpted by the ceaseless action of water upon the surface.
d. rift valleys
rift valleys from when two oceanic plates converge
Answer:
The invention of the steam engine and the construction of steel bridges to carry trains across various physical features led to ever-increasing demand for the materials and labor to build more trains and tracks
Explanation:
Chapter 11 AP HUG quiz. Thank me later.
