Which is the biggest ocean on the Earth?
        
        
          
            Planet Earth
          
        
        
          
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            Earth as
          
        
        
          
            a magnet
          
        
        
          Have you ever used a
        
        
          compass to find your way?
        
        
          It works because the Earth
        
        
          acts as if it has a giant
        
        
          bar magnet in the middle.
        
        
          The Earth is the planet
        
        
          where we all live. It is a
        
        
          huge ball of hot, liquid
        
        
          rock with a solid surface
        
        
          called the crust. Planet
        
        
          Earth travels in space.
        
        
          Our planet
        
        
          
            The Earth’s surface
          
        
        
          There are seven huge pieces
        
        
          of land on the Earth’s surface.
        
        
          They are called continents. They
        
        
          cover about one-third of the
        
        
          surface. Oceans cover the rest.
        
        
          
            Spinning Earth
          
        
        
          The Earth slowly spins around
        
        
          once a day. The line it spins around
        
        
          is called the Earth’s axis. At the ends
        
        
          of the axis are the Earth’s poles.
        
        
          
            North
          
        
        
          
            Pole
          
        
        
          The Earth’s
        
        
          axis goes
        
        
          through
        
        
          its poles.
        
        
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            South
          
        
        
          
            Pole
          
        
        
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