The American attitude toward the French Revolution has been generally favorable—naturally enough for a nation itself born in revolution. But as revolutions go, the French one in 1789 was among the worst. True, in the name of liberty, equality, and fraternity, it overthrew a corrupt regime. Yet what these fine ideals led to was, first, the Terror and mass murder in France, and then Napoleon and his wars, which took hundreds of thousands of lives in Europe and Russia. After this pointless slaughter came the restoration of the same corrupt regime that the Revolution overthrew. Aside from immense suffering, the upheaval achieved nothing.
A. the air. All the other choices don't make sense.
If you gain land through the war you can gain new resources to use in trade and new ports to trade with.
Running water is the leading cause of soil erosion, because water is abundant and has a lot of power. Wind is also a leading cause of soil erosion because wind can pick up soil and blow it far away.