Volcanism is largely basaltic, a black rock relatively rich in Mg, Si, O and Ca.Ħ. Composed mainly of silicates in addition to Fe and Ni.ĥ. Are generally small, rocky bodies sharing many similarities and also differences.Ĥ. Closest to the sun and consist of Mercury, Venus, Earth and Mars.Ģ. The rotations of planets, moons and other bodies are inherited from the rotation of the ancient gas cloud from which they formed.ġ. Meteoroids, asteroids and comets also follow orbits around the sun.Ħ. Most of the moons revolve around the planets in the same direction as the planets revolve around the sun.ĥ. The planets generally revolve in the same direction around the sun and within the plane of the ecliptic except for Pluto, which is tilted at 17 o to the ecliptic.Ĥ. The orbits of the planets are elliptical around the sunģ. Figure 1.3: The Solar System consists of the Sun, nine planets, 61 moons and a multitude of asteroids, comets and meteoroids.Ģ. CHAPTER 1: ORIGIN OF THE PLANETS & THE SOLAR SYSTEM TODAYġ.
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