2 Module Overview For the past 8,000 years, the ice cores of Antarctica and Greenland indicate that Earthâs climate has been unusually stable. Yet global climate has changed several times in Earthâs geological history, sometimes at a relatively abrupt rate, as shown by the Greenland ice core data. In the module, Temperature Over Time, you compared temperature patterns and trends over different time scales and regions.
It feeds on a wide variety of creatures. Smaller seals probably eat mostly krill, but also squid and fish. Larger leopard seals probably switch from krill to more substantial prey, including king, adelie, rockhopper, gentoo, emperor, and chinstrap penguins, and less frequently, other seals, such as crabeater seal.
Other foods. While polar bears have evolved as a highly specialized predator of ice seals, they are always alert to other food sourcesâincluding vegetation, geese, bird eggs, and even the occasional small mammal.oth polar bears and ringed seals depend on it. 1  Polar bears' lives are a cycle of feasting and fasting. 2  When hunting is good and a polar bear is in good body condition, the bear will eat only the seal's blubber and skin. 3  A polar bear can eat 100 pounds of blubber in a single sitting!