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This radio broadcast discusses how permafrost (permanently frozen ground) in Alaska and the Arctic has been melting, and what the potential consequences might be. These include damage to many engineering structures and coastlines and the release of gases into the atmosphere which may compound the problem of climate warming. About two-thirds of Alaska is covered by permafrost and a recent report says ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Climatology, Cryology
 
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Some of the thickest and oldest ice in the Arctic Ocean is disappearing. This radio broadcast (2003) reports on new large cracks found in the Ward Hunt Ice Shelf, which had been intact for the last 3000 years. Scientists say these cracks are a sign of a warmer Arctic climate. As the ice shelf melts, it is changing the Arctic environment in profound ways, causing changes in the food chain based on ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Climatology, Cryology, Ecology
 
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This radio broadcast discusses the air pollution in Fairbanks, Alaska, including the phenomenon of ice fog, which is a sometimes dangerous, ground-hugging cloud of smoke, coal soot, water vapor, and a virtual cocktail of potentially harmful chemicals such as carbon monoxide. The 2001 broadcast explains how the geography and climate of Fairbanks combine to create conditions where pollution clings near ... Full description.
Grade level: Middle (6-8), High (9-12), College (13-14), General public
Resource type: Radio broadcast
Subject: Atmospheric science, Environmental science
 
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This radio broadcast explores some ideas about the cause of a 1946 tsunami which swept from Alaska through the Pacific and killed more than 150 people. The tsunami was one of the worst of the 20th Century. Scientists today still cannot agree on just what caused it. They think it was an earthquake, an undersea landslide, or possibly both. The answer may change how scientists study tsunamis and how ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Natural hazards
 
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The Second Law of Thermodynamics can be stated as: Energy spontaneously tends to flow from being concentrated in one place to becoming diffused and spread out - or - disorder in a closed system will increase. This radio broadcast explains this law, its implications as to time and energy in the universe, and whether the Second Law tends to be refuted by the existence of life and the theory of evolution. ... Full description.
Grade level: High (9-12), General public
Resource type: Radio broadcast
Subject: Physics, Space science
 
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This broadcast describes the four great Eons of history: the Hadean, the Archean, the Proterozoic and the Phanerozoic. Together, they encompass four and a half billion years. How can we begin to make sense of such a huge swathe of time? And can we be sure that we have got the age of the Earth right? Geologists use Eras, Periods and Epochs to further punctuate what is known as Deep Time, but can we ... Full description.
Grade level: High (9-12), General public
Resource type: Radio broadcast
Subject: Geologic time
 
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What causes volcanoes? What role do they play in the formation and maintenance of our planet? And is it ever possible to predict when and where they are about to erupt? This radio broadcast covers the science of volcanology; Earth's layers; the rising up of magma between tectonic plates; the difference between diffusive and explosive volcanoes; and the ongoing cooling of Earth since its formation, ... Full description.
Grade level: High (9-12), General public
Resource type: Radio broadcast
Subject: Geology, Natural hazards
 
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This radio broadcast explains how, by examining the clues trapped in amber, a remarkable insight can be gained into how life in the ancient forests would have looked, smelled and even sounded. Throughout the broadcast, there are extracts from a reconstruction of the vanished world of the Dominican amber forest. Scientists explain the difference between the deposits from the Dominican Republic and ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Paleontology
 
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Two separate radio broadcasts are featured: the first discusses NASA's 16 billion dollar-plus budget of 2005, the second is an interview with a physicist and mathematician about quantum mechanics and the laws of the universe. Significant NASA budget items include fixing the Hubble space telescope; sending astronauts and robots to the moon and Mars; revolutionizing aeronautics with unmanned airplanes; ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Physics, Policy issues, Space science
 
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Though the Kyoto Protocol went into effect in February of 2005, it will not be a quick fix: global temperatures are predicted to rise well into this century. This radio broadcast takes a look at some technologies - from wind power to hydrogen fuel cells - that could curb climate change by reducing greenhouse gases. There is discussion about what countries are doing to reduce global warming, such as ... Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Climatology, Environmental science, Policy issues, Technology
 
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Results 41 - 50 of 117 <<  1 2 3 4 5 6 7 8 9  >>