Barry wants to know if the type of batteries will affect how well a circuit works. He uses four different batteries. He hooks each type of battery up to a wire and a lightbulb in a circuit. He measures the brightness of the light given off by the lightbulb.

the rocks are classified by the geological process they are formed by. the three main groups of rocks are igneous, metamorphic, and sedimentary. minerals are not they are classified under the chemical classes they are in. these groups include silicates, sulfates and carbonates.

the statements that apply here about binary star system are

"have stars that might appear to wobble"

"often have one star that is brighter than other"

a binary star is a star system consisting of two stars revolving around their common barycenter. systems of two or more stars are called multiple star systems.