For Copernicus, I think it was On the Revolution of the Celestial Spheres. I think For Newton it was Philosophiæ Naturalis Principia Mathematica.
Ans: The ruins of two ancient cities, Harappa and Mohenjo-Daro (both in modern-day Pakistan), and the remnants of many other settlements, have revealed great clues to this mystery. Harappa was, in fact, such a rich discovery that the Indus Valley Civilization is also called the Harappan civilization.
The South relied heavily on steamboats for transportation of supplies and troops. They absolutely needed the Mississippi River to be effective in anyway during the war. The North also used it for transporting, but they had railroads. They were mostly concerned with keeping the South from using it.
Answer:
enormous size.
lack of trees.
semi-arid - little water available.
unpredictable weather, including extremely cold and violent winters.
ferocious winds - the winter 'Northers' and the scorching summer winds.
many areas flat and featureless.
inhabited by locusts and grasshoppers.
inhabited by wolves.
<span>Federalism is the most important.
</span><span>I could be wrong but I gave it my best shot.
Hope this helps!!</span>
