Gina designed a model to show the steps in the Nebular theory of formation of
planetary systems. Which of these diagrams best represents the third step of Ginas model? 1) condensation and contraction of cloud due to gravity 2) rotation of cloud and dust 3) formation of planet 4) fusion of gas and dust at the center to form the sun

The text compares alternating current with direct current. how are they different? a alternating current reverses direction in the electrical wiring. direct current flows in one direction only. b direct current reverses direction in the electrical wiring. alternating current flows in one direction only. c direct current is powered by solar energy. alternating current is powered by electrical energy. d alternating current does not move in the electrical wiring. direct current does move in the electrical wiring.