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Inner Planets

Inner Planets. Chapter 2.3 Pages 62-69. Inner Planets. Terrestrial planets Small, solid planets Mercury Venus Earth Mars. Mercury. 1 st Planet , 58,000,000km Rotation 59 Earth days Revolution 88 Earth Days Extremely thin atmosphere

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Inner Planets

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  1. Inner Planets Chapter 2.3 Pages 62-69

  2. Inner Planets • Terrestrial planets • Small, solid planets • Mercury • Venus • Earth • Mars

  3. Mercury • 1stPlanet, 58,000,000km • Rotation 59 Earth days • Revolution 88 Earth Days • Extremely thin atmosphere • Fast moving, very hot, molecules escaped Mercury’s weak gravitational pull.

  4. Mercury • Solid surface, many flat planes and many craters • Greatest temperature range of all planets (430°C to - 170°C) • No moons

  5. Venus • 2nd Planet 108,000,000km • “Evening Star” • Similar in size and density to Earth (“Earth’s twin”) • A solid, rocky, cratered surface with volcanoes.

  6. Venus • Rotates so slowly (8 months) that its day is longer than its year (7.5 months) • Rotates east to west (retrograde rotation) • No moons

  7. Venus’ Atmosphere • Never has a sunny day. • Atmosphere so thick, the pressure is 90 times that on Earth. • Atmosphere is mostly CO2 and sulfuric acid • Clouds trap heat and surface is 460°C. (Greenhouse Effect)

  8. Earth • 3rd Planet 150,000,000 km • Rotation 24 Earth hours • Revolution 365.25 Earth Days • 70% covered in water • Supports life.

  9. Earth • As an atmosphere – mostly 78% nitrogen and 21% oxygen • 3 main layers – crust, mantle and core • Dynamic planet (constantly changing) • One natural satellite called Moon.

  10. Mars • 4th Planet 228,000,000km • “Red planet” – solid, rocky planet. • Rotation 1.03 Earth Days • Revolution- 687 Earth Days • Two moons – Phobos and Deimos

  11. Mars • Mars has seasons because it has a tilted axis • Winds stir up soil, causing dust storms • Frozen ice caps of carbon dioxide at south pole and frozen ice at north pole during the winter season. • Very thin atmosphere, mostly carbon dioxide

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