1) The gravity of the Sun keeps the Solar System together. a) True b) False 2) The solar nebula consisted mainly of two gases called... a) oxygen and carbon dioxide. b) hydrogen and helium. c) oxygen and hydrogen. 3) After the collapse, the material clumped together and turned into a burning ball of gas. a) True b) False 4) The burning ball of gas was called... a) nebula b) sun. c) protostar. 5) The temperature and pressure of the material inside the protostar increased, the hydrogen fusioned and the Sun was formed. a) True b) False 6) The Sun is the smallest object of the Solar System. a) True b) False 7) The Sun can be divided into six layers: a) The corona, the chromosphere, the photosphere, the convected zone, the radiative zone, and the core. b) The rays, the nucleus, the seeds, the rings, the corona and the heat. 8) The sun is made up of... a) 50% hydrogen, 50% helium b) 30% helium, 30% oxygen, 40% nitrogen c) 91% hydrogen, 8.9% helium and 0.1% heavier elements (like nitrogen and carbon). 9) The temperature in the surface of the sun is hotter than in the center of it. a) True b) False, the center is hotter! 10) In the center of the Sun the temperature reaches around... a) 5 million Celsius! b) 15 million Celsius! c) 10 thousand Celsius!

How was the Sun formed?

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