Browse Titles - 17 results

Habitable Planet, Unit 1, Many Planets, One Earth
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produced by Alex Griswold, fl. 1982, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 1 (District of Columbia: Annenberg Learner, 2007), 28 mins

Astronomers have discovered dozens of planets orbiting other stars, and space probes have explored many parts of our solar system, but so far scientists have only discovered one place in the universe where conditions are suitable for complex life forms: Earth. In this unit, examine the unique characteristics that...

produced by Alex Griswold, fl. 1982, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 1 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Habitable Planet, Unit 2, Atmosphere
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produced by Alex Griswold, fl. 1982 and Tobias McElheny, fl. 1998, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 2 (District of Columbia: Annenberg Learner, 2007), 28 mins

The atmosphere is a critical system that helps to regulate Earth's climate and distribute heat around the globe. In this unit, discover the fundamental processes that cause atmospheric circulation and create climate zones and weather patterns, and learn how carbon cycling between atmosphere, land, and ocean reserv...

produced by Alex Griswold, fl. 1982 and Tobias McElheny, fl. 1998, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 2 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Habitable Planet, Unit 3, Oceans
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produced by John Browne, fl. 1983, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 3 (District of Columbia: Annenberg Learner, 2007), 28 mins

Oceans cover three-quarters of the Earth's surface, but many parts of the deep oceans have yet to be explored. Learn about the large-scale ocean circulation patterns that help to regulate temperatures and weather patterns on land, and the microscopic marine organisms that form the base of marine food webs.

Abou...

produced by John Browne, fl. 1983, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 3 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Habitable Planet, Unit 4, Ecosystems
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produced by Alex Griswold, fl. 1982 and Tobias McElheny, fl. 1998, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 4 (District of Columbia: Annenberg Learner, 2007), 28 mins

Why are there so many living organisms on Earth, and so many different species? How do the characteristics of the nonliving environment, such as soil quality and water salinity, help determine which organisms thrive in particular areas? These questions are central to the study of ecosystems—communities of living...

produced by Alex Griswold, fl. 1982 and Tobias McElheny, fl. 1998, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 4 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Habitable Planet, Unit 5, Human Population Dynamics
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produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 5 (District of Columbia: Annenberg Learner, 2007), 28 mins

What factors influence human population growth trends most strongly, and how does population growth or decline impact the environment? Does urbanization threaten our quality of life or offer a pathway to better living conditions? What are the social implications of an aging world population? Discover how demograph...

produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 5 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Habitable Planet, Unit 6, Risk, Exposure, and Health
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produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 6 (District of Columbia: Annenberg Learner, 2007), 28 mins

We are exposed to numerous chemicals every day from environmental sources such as air and water pollution, pesticides, cleaning products, and food additives. Some of these chemicals are threats to human health, but tracing exposures and determining what levels of risk they pose is a painstaking process. How do har...

produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 6 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Habitable Planet, Unit 7, Agriculture
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produced by Alex Griswold, fl. 1982 and Tobias McElheny, fl. 1998, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 7 (District of Columbia: Annenberg Learner, 2007), 28 mins

Demographers project that Earth's population will peak during the 21st century at approximately ten billion people. But the amount of new cultivable land that can be brought under production is limited. In many nations, the need to feed a growing population is spurring an intensification of agriculture - finding w...

produced by Alex Griswold, fl. 1982 and Tobias McElheny, fl. 1998, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 7 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Habitable Planet, Unit 8, Water Resources
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produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 8 (District of Columbia: Annenberg Learner, 2007), 28 mins

Earth's water resources, including rivers, lakes, oceans, and underground aquifers, are under stress in many regions. Humans need water for drinking, sanitation, agriculture, and industry; and contaminated water can spread illnesses and disease vectors, so clean water is both an environmental and a public health i...

produced by Clive A. Grainger, fl. 1999, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 8 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Habitable Planet, Unit 9, Biodiversity Decline
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produced by Tobias McElheny, fl. 1998, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 9 (District of Columbia: Annenberg Learner, 2007), 28 mins

Living species on Earth may number anywhere from 5 million to 50 million or more. Although we have yet to identify and describe most of these life forms, we know that many are endangered today by development, pollution, over-harvesting, and other threats. Earth has experienced mass extinctions in the past due to n...

produced by Tobias McElheny, fl. 1998, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 9 (District of Columbia: Annenberg Learner, 2007), 28 mins
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Habitable Planet, Unit 10, Energy Challenges
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produced by Alex Griswold, fl. 1982 and Tobias McElheny, fl. 1998, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 10 (District of Columbia: Annenberg Learner, 2007), 28 mins

Industrialized nations rely on vast quantities of readily available energy to power their economies and produce goods and services. As populations increase in developing countries and citizens demand better standards of living, global energy consumption will continue to rise, along with demands for non-fuel minera...

produced by Alex Griswold, fl. 1982 and Tobias McElheny, fl. 1998, Harvard-Smithsonian Center for Astrophysics, in Habitable Planet, Unit 10 (District of Columbia: Annenberg Learner, 2007), 28 mins
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