Briefly explain how the length of twilight varies with ...

[biggirl4568]

Briefly explain how the length of twilight varies with seasons.

Question 2

The wind-chill index ____.
 A) relates body heat loss with wind to an equivalent temperature with no wind
  B) indicates the temperature at which water freezes on exposed skin
  C) takes into account humidity and air temperature in expressing the current air temperature
  D) determines how low the air temperature will be on any given day

[ecox1012]

Answer to Question 1

The length of twilight depends on season and latitude. During the summer in middle latitudes, twilight adds about 30 minutes of light to each morning and evening. The duration of twilight increases with increasing latitude, especially in the summer. At high latitudes during the summer, morning and evening twilight may converge, producing a white night-a nightlong twilight. At low latitudes, twilight tends to be shorter, with more abrupt transitions between daylight and darkness.

Answer to Question 2

A