the indus valley civilization was a cultural hearth because responses a. it developed a caste system with four varnas. b. it borrowed its culture from other regions. c. it had rich cities, running water, and writing. d. it was a place where civilization began and spread.

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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what speech are you referring to? ?