The arctic and anarchic circles mark the area where the sun is either or the horizon for at least 24 hours

Answer.Arctic:Week by week after the March equinox, the region experiencing 24 hour daylight grows, extending from the North Pole until the June solstice, when the entire region from the Arctic Circle to the North Pole experiences 24 hour daylight. Following the June solstice, the region in the Arctic, this 24 hour daylight diminishes week by week until the September equinox, when the Sun sets at the North Pole and remains below the horizon for the next 6 months. The exact opposite happens from September to December. It's dark 24 hours a day.The darkness diminished from December until March, when the Sun again rises at the North Pole; Antarctic:The exact opposite.

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answers.com says temperate reagions

a characteristic is a deep cut in the earth or left over rock aka till.