welcome once again to Alphabe-Thursday.
This week over at Jenny's Place, we are all learning about the letter "I". Check it out!
Icebergs are essential
Essential to the lives of the Polar bears:
Polar bear populations are in decline. By 2050, two-thirds of the world's polar bears are likely to be gone.
- Climate change, which is causing ice to thin and melt, is reducing polar bear habits.
- Loss of sea ice leads to higher energy requirements to locate food.
- Mortality rates are increasing. 42% of Alasakan cubs reach 12 months of age. This number was 65% fifteen years ago.
Icebergs are enormous. They can be taller than the Statue of Liberty and as big as a small state. Normally, only a tiny part of an iceberg can be seen from the surface of the water. Thousands of these massive glacial chunks are formed each year and many are carried hundreds of miles by ocean currents until they gradually melt away.
The Titanic's tragic collision with an iceberg in 1912 shows just how dangerous icebergs can be. The Titanic was such a massive vessel that passengers barely felt the impact as the iceberg ripped a gaping hole in the bottom of ship. The Titanic sank on its maiden voyage, but the glacial ice that doomed the "unsinkable ship" may have been more than 15,000 years old! Now, satellites carefully track these colossal ice cubes and create detailed charts to warn navigators about their constantly shifting locations (for an example, see http://www.natice.noaa.gov/products/iceberg/).
- While icebergs float in frigid saltwater oceans, they are actually made of freshwater.
- More than two-thirds of the Earth's freshwater exists as ice in the form of glaciers and ice caps.
- Each year, there are enough new icebergs formed in Antarctica to supply freshwater to the world's six billion inhabitants and every industry on our planet for four months.
- Antarctica and Greenland account for more than 98 percent of the world's ice-mass.
- Icebergs drift at a rate of about 0.4mph (0.7km/h). The speed at which icebergs move is affected by many things, including their size and shape, ocean currents, waves and wind.
Icebergs essentially killed thousands of peoplehttp://www.theepochtimes.com/n2/content/view/43347/