Since Earth rotates on it's axis every 24 hours, only about half the planet is illuminated at one time. From the Earth, on the surface it seems that the sun is moving across the sky, but this is only a illusion due to our particularly perspective.
"The sun's apparent motion across the sky from East to West is due to the..."
Answer: Earth's rotation.
Answer: light energy
Explanation: Hope this helps!
The tanks is unfit for consumption
A biggie: the transcontinental railroad. Because it would economically improve wherever it was, both the North and the South competed for the railroad to be in their respective territory, evidenced by the Kansas-Nebraska Act and the Gadsen Purchase and induction of California as a free state in 1860.
In addition: people could get land cheap because it was abundant and might leave to start afresh economically.
There's other stuff I can't remember as clearly, but there's a little and I hope it helps :)
