PLANET EARTH

Characteristics
1. The Earth is the only planet with: An atmosphere containing oxygen, an average temperature of 15º C, a water cycle, and life.
Movement
1. Moves into two different ways
  1. Rotation: The Earth rotates on a slightly tilted axis, always in the same direction, this rotation cause the sequence of day and night
  2. Revolution: The Earth´s revolution around the Sun is an eclipse, it takes 365 days to complete the revolution, this is one year.
Moon Movement
1. Moves into two different ways
  1. Rotation: The moon takes 29.5 days to rotate once on its axes
  2. Revolution: The Moon takes about 28 days to orbit the Earth once
Spheres
1. Hydrosphere
  1. All the water in the Earth
2. Atmosphere
  1. Layer of air around the Earth
    1. Air: Mixture of gases (78% nitrogen, 21% oxygen
3. Biosphere
  1. Is made of living things that affect the other spheres
4. Geosphere
  1. Crust
    1. Continental
      1. Granite
      2. Relief features (600 m altitude)
        Mountain Ranges
        Great plains
        Continental shelves
    2. Oceanic
      1. Basaltic rocks (volcanic activity)
        Relief features: (4,500 m depth)
        Abbysal plains
        Oceanic ridges
        Chains of mountains
        Submarine volcanoes
        Archipelagos
        Oceanic trenches
  2. Mantle
    1. Solid Rock 1.000-4.000ºC
      1. It lies 2,900 km below the surface
  3. Core
    1. Iron
      1. Inner (solid)
      2. Outer (liquid)
Phases of the Moon
1. New Moon: The Moon is between the Sun and the Earth, so the Moon is not visible
2. First quarter: Half the side lit by the Sun

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PLANET EARTH

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	Creado por Gonzalo Cervera Díaz de Rivera hace alrededor de 11 años