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According to the nebular theory, the planets formed from a process called . after our protosun formed, remaining dust and gas from the nebula collided, combined, and gravitated together to form the planets.

Why are radio observatories located in valleys far away from urban centers? a. to shield them from electromagnetic interference b. to avoid sound pollution c. to avoid disturbing people living in the city d. to shield them from water vapor

Which composer was renowned for creating expressive gregorian chants? a. hildegard of bingen b. carlo gesualdo c. josquin desprez d. guillaume de machaut