Richard feels that the increasing use of fuels such a coal or diesel to generate electricity are leading to pollution in his neighborhood. he therefore decides to use solar energy as a source for generating electricity. which device should richard use? internal combustion engine electric motor photovoltaic cell ac generator

Which of the following statements is a scientific claim? a. the early solar system had large amounts of water; so, the oldest objects in the solar system should also be abundant in water. b. earth is shaped like a sphere even if not all of the scientific observations related to its shape support this idea. c. the mass of the universe is much greater than current models predict; it is not possible to explain this inconsistency. d. planet earth is abundant in water, but there is no way to scientifically determine from where earth's water originated.