The answer is D to your question
He studied the fossils' age and how tall the mountains are. He also studied how old they are. I don't know about Coal Beds but he also used balloons to find out the continents were once a big supercontinent called Pangaea and they apparantly drifted apart
C. It extended the abolitionists power to operate the Underground Railroad
Mountainous dry summers and cool winters. Fertile enough soil to harbour cities a few forested area and plains but mostly hills and mountains.
