Scientists find dense rock on earth's surface that is made of magnesium and smaller amounts of silicon. what layer of earth might the rock scientists study?

Which statements are true of a scientific theory but not a hypothesis

Which of the following can be reduced by the use of renewable energy sources? a. social costs b. economic costs c. environmental costs d. all of the above select the best answer from the choices provided a b c d

Science which of the following is an example of a cyclic behavior that is seasonal? i think the answer is d, i just need to double check : ). a. running from predators. b. searching for water. c. hunting at night. d. migrating for warmth. ***