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Fukushima accident | Summary, Effects, & Facts


TEPCO officials reported that tsunami waves generated by the main shock of the Japan earthquake on March 11, 2011, damaged the backup generators at the Fukushima Daiichi plant. Although all three of the reactors that were operating were successfully shut down, the loss of power caused cooling systems to fail in each of them within the first few days of the disaster. Rising residual heat within each reactor’s core caused the fuel rods in reactors 1, 2, and 3 to overheat and partially melt down, leading at times to the release of radiation. Melted material fell to the bottom of the containment vessels in reactors 1 and 2 and bored sizable holes in the floor of each vessel a fact that emerged in late May. Those holes partially exposed the nuclear material in the cores. Explosions resulting from the buildup of pressurized hydrogen gas occurred in the outer containment buildings enclosing reactors 1 and 3 on March 12 and March 14, respectively. Workers sought to cool and stabilize th ....

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polar bear | Description, Habitat, & Facts


© Stockbyte/Thinkstock
What is a polar bear?
A polar bear is a great white northern bear (family Ursidae) found throughout the Arctic region. Except for one subspecies of grizzly bear, the polar bear is the largest and most powerful carnivore on land. It has no natural predators and knows no fear of humans, making it an extremely dangerous animal.
What do polar bears eat?
Polar bears are mostly carnivorous. They eat the ringed seal as well as the bearded seal and other pinnipeds. Additionally, polar bears are opportunistic as well as predatory: they will consume dead fish and carcasses of stranded whales and eat garbage near human settlements. ....

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