Definition: This is the side of the Moon that is visible from the Earth.

Synchronous Rotation or Tidal Locking

Explanation: Only one side of the moon is visible to earth because the moon rotates on its axis at the same rate that the moon orbits the earth.

places of higher salinity. there are parts of the ocean where hardly any rain falls but warm dry winds cause lots of evaporation. this evaporation removes water – when water vapour rises into the atmosphere, it leaves the salt behind, so the salinity of the seawater increases. this causes the seawater to become denser.

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