What was the importance of obsidian in the Olmec culture?

It was used to make tools.
It was used to create pottery.
It was used as a form of money.
It was used in jaguar sculptures.

Why did separate government develop in ancient greece?

What has contributed to the growth of agriculture as big business in the midwest

In 1914, alabama produced 1.7 million bales of cotton, but three years later produced only 515,000, bales. meanwhile, in georgia, 5.2 million acres of land was dedicated for cotton production in 1914, but by 1923 there were just 2.6 million acres used for growing cotton. all of this was the result of the work of a tiny insect: the boll weevil. alabama and georgia first felt the effects of the boll weevil at different times. what would account for this difference in timing?