Why are there high-pressure areas at each pole and a low-pressure ...

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Why are there high-pressure areas at each pole and a low-pressure belt in the equatorial region?
 
  What will be an ideal response?

Question 2

Which of the following statements comparing a tidal power electricity-generating with a conventional thermal power plant is correct?
 
  A) The initial cost of building a tidal power electricity-generating plant may are higher.
  B) The operating costs of a tidal power electricity-generating plant are higher.
  C) The periodicity of the tides is an advantage of a tidal power electricity-generating plant.
  D) Tidal power initially requires fossil or nuclear fuels to get started.
  E) Conventional thermal power is considered a cleaner and renewable resource.

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Answer to Question 1

The low-pressure belt at the equator is due to more direct or incident solar radiation during most of the year. This causes both the land and ocean to heat up, as well as the air above the land and ocean. Warmer temperatures cause more evaporation, especially over the ocean, creating relatively light air that is both warm and humid. This warm, moist air tends to rise vertically, creating low air pressure. In contrast, air at the poles is relatively dry and very cold, which causes the air to descend back towards the surface, creating high air pressure.

Answer to Question 2

A

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