What can scientists learn from the rate at which radioactive elements decay? . a: a rock's actual, or absolute, age. b: the raletice age of rock layers. c: where one soil horizon ends and the next begins. d: the difference between molds and casts. me! : )

If we represent the solar system on a scale that allows us to walk from the sun to pluto in a few minutes, then a) the planets are microscopic and the stars are millions of miles away. b) the planets are the size of basketballs and the nearest stars are a few miles away. c) the planets are marble size or smaller and the nearest stars are thousands of miles away.