Polar questions

Greenland is an autonomous country within the Kingdom of Denmark since the early 18th century. The economy of Greenland strongly depends on Denmark's annual subsidy to the island. The subsidy is slated to diminish gradually over time as Greenland's economy is strengthened by increased income from the extraction of natural resources.

A resting seal would try to escape to the sea when attacked (where it easily outswim a polar bear), so the attack from the sea is a very efficient hunting strategy. Polar bears are able to dive to a depth of 15 feet and remain submerged for up to two minutes.

When a piece of iceberg ice melts, it makes a fizzing sound called "Bergie Seltzer". This sound is made when the water-ice interface reaches compressed air bubbles trapped in the ice. As this happens, each bubble bursts, making a 'popping' sound. The bubbles contain air trapped in snow layers very early in the history of the ice, that eventually got buried to a given depth (up to several kilometers) and pressurized as it transformed into firn then to glacial ice.

All penguins are native to the Southern Hemisphere, but they are not found only in cold climates. Several species are found in the temperate zone of South Africa and South America. The Galápagos Penguin (pictured) lives near the equator. Fossils show that many prehistoric species lived in warm climates.

Alaska was colonized by Russian fur traders. Rather than hunting by themselves, the Russians forced the Aleuts to do the work for them. Many of Aleuts had been removed from their home islands and sent as far south as California to hunt sea otter.

As the rabbit runs its rear legs land in front of its front paws, therefore the rear tracks indicate the direction of travel. The position of the front and rear paws is closer together as the rabbit slows down and further apart as it speeds up.