All About Volcanoes by Bill Kirk

By Bill Kirk

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Conversely, during the summer period, there are nights within these polar realms when the Sun never sets. 5° therefore mark important limits around the poles and are called the Arctic and Antarctic Circles, respectively. The uneven heating of the Earth’s surface creates turbulence in the atmosphere. Light energy striking the land sur- The tilt of the Earth on its axis results in seasonal variation in climate. In the Northern Hemisphere, days are longer when the axis tilts toward the Sun (summer) and shorter when the tilt is away from the Sun (winter).

Conversely, during the summer period, there are nights within these polar realms when the Sun never sets. 5° therefore mark important limits around the poles and are called the Arctic and Antarctic Circles, respectively. The uneven heating of the Earth’s surface creates turbulence in the atmosphere. Light energy striking the land sur- The tilt of the Earth on its axis results in seasonal variation in climate. In the Northern Hemisphere, days are longer when the axis tilts toward the Sun (summer) and shorter when the tilt is away from the Sun (winter).

Much of the tundra of northern Canada is also relatively flat and it is crossed by some major rivers, such as the Mackenzie River. The landscape becomes more mountainous again in the east, where the Torngat Mountains of Labrador rise to more than 6,500 feet (2,000 m). Scattered along the north Canadian coastline are many islands, including some of the largest islands in the world, such as Baffin Island. Farther east lies the massive island of Greenland, whose interior (80 percent of the total area) is covered by a permanent ice sheet.

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