How did windmills impact the frontier? A. They provided a steady supply of water for crops.
B. They served as a source of light in West Texas,
C. They caused the open frontier to close.
D. They increased the cost of electricity

copernicus finished the first manuscript of his book, "de revolutionibus orbium coelestium" ("on the revolutions of the heavenly spheres") in 1532. in it, copernicus established that the planets orbited the sun rather than the earth. he laid out his model of the solar system and the path of the planets.

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transform it from an expensive luxury to a mid-priced good