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25 Cards in this Set
- Front
- Back
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During the period from 21,000 years ago to 2,000 years ago, the global sea level rose how many meters?
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120 Meters
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Since the last ice age 18,000 years ago, sea level has risen about how many meters?
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130 Meters
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In the twentieth century, sea level began rising an average of how many millimeters per year?
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1.7 Millimeters Per Year
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Glaciers store about how much percentage of the world's freshwater?
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75%
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During the maximum point of the last ice age, glaciers covered about how much percentage of the total land area?
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32%
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In the United States, glaciers cover over how many square kilometers?
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75,000 Square Kilometers
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Where are most of the glaciers in the United States located?
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Alaska
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If all land ice melted, sea level would rise approximately how many meters worldwide?
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70 Meters
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What is North America's longest glacier?
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Bering Glacier
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In Washington State, the state with the largest area of glaciers in the contiguous United States, melting glaciers provide how many liters of water each summer?
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1.8 Trillion Liters
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The land underneath parts of the West Antarctic Ice Sheet may be up to how many kilometers below sea level?
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2.5 Kilometers
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Thinning rates in Antarctic glaciers in the last 5 to 7 years are more than ____ the amount seen in previous years.
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Twice
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Tropical glaciers in Africa have decreased in area by how much on average, since the early 1900s?
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60% to 70%
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The melting of ice sheets and ice shelves that sit on top of land, will result in _____ sea levels.
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Higher
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The global sea level has risen by how many inches over the past century?
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4 to 8 inches
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Some scientists believe that the Arctic could be ice free by what year?
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2030
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According to NASA, Greenland is losing about how many tons of land ice every year?
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100 Billion
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What percentage of modern glacial ice is located in the Arctic and Antarctic?
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99%
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The Antarctic ice sheet has been in existence for at least how many years?
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40 Million Years
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In total, Alaska's glaciers empty over how many gallons of water into streams and rivers every summer?
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50,000 Billion Gallons
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Are nearly all glaciers in Alaska melting to some degree?
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Yes
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How much of an iceberg is below the water?
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90%
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Simulations project that a ____ rise in temperature would cause nearly all of the world's glaciers to melt.
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4 Degrees Celcius
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Arctic sea ice extent set an all-time record low in September of what year?
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2007
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At the current rate of retreat, all of the glaciers in Glacier National Park will be gone by what year?
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2070
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