GACE Middle Grades Science Exam Guide Questions and CORRECT Answers
tidal hypothesis - Ans Theory that the solar system started with a near collision of sun and large star. Few astronomers believe this theory. condensation hypothesis - Ans solar system began with rotating clouds of dust and gas. Condensation happened in center to form sun, and smaller parts of clouds formed. More astronomers believe in this idea. Core - Ans Outer core- liquid; inner core- solid. Very dense in center. Believed that core is 80% iron. Helps heat oceans. Mantle - Ans Surrounds core. Semi-solid/plastic and the viscosity varies as pressures and temps. change at different depths
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