After the core of a massive star becomes a neutron star, the rest of the star's material a. falls inward very slowly, taking billions of years to get really compressed b. makes a planetary nebula, which gently moves outward from the center c. is vaporized by the incredible heat of the dying star and evaporates d. explodes outward as a supernova e. continues regular fusion and returns to the main sequence Submit Your Answer

the duration of a photographic flash is related to an rc time constant, which is 0.100 μs for a certain camera.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods

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