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Infrared: More Than Your Eyes Can See

The electromagnetic spectrum, spanning energies and wavelengths from radio waves to gamma rays, encompasses all forms of light. Infrared radiation, located in the range just beyond visible light, is emitted by all matter and is very useful in gathering data about Earth and space. In this video segme

Losing Permafrost in Alaska

This video adapted from Spanner Films describes the effects of changes to permafrost, the frozen layer of soil and ice that underlies much of Alaska, caused by a warming climate. Permafrost, some of which has persisted since the last ice age, more than 10,000 years ago, is melting rapidly. In affect

Living from the Land and Sea

Learn about the cycle of seasons that guides the traditional Alaska Native subsistence way of life, in this video adapted from the Alaska Native Heritage Center focuses. As the seasons change and the available resources change, so do Alaska Native peoples' hunting and gathering activities. Recognizi

How Would You Turn a Bolt in Space?

Tools such as saws, hammers, and levers are designed to make work easier. Sometimes, the environment in which a person works dictates whether or not a certain tool will get the job done. In the microgravity environment of space, astronauts are often required to do experiments or simple repairs. On E

Characteristics of the Sun

Our Sun is an ordinary star — just one of billions of stars in our galaxy alone. However, as our own star, the Sun holds special status for us and is essential to our existence. The Sun's gravity holds the solar system together, and nuclear fusion within the Sun supplies the energy for life on Earth

Plate Tectonics: An Introduction

In the early 1900s, most geologists thought that Earth's appearance, including the arrangement of the continents, had changed little since its formation. This video segment, adapted from the "Earth Explorer" episode of Discovering Women, describes the impact the theory of plate tectonics has had on

Earth's Cryosphere: The Arctic

This video segment adapted from NASA uses satellite imagery to provide an overview of the cryosphere in the northern hemisphere, including the Arctic. Investigate the cryosphere's role in North America, the extent of permafrost in the northern hemisphere, and how the polar regions play a role in reg

Earth's Cryosphere: Antarctica

NASA satellite imagery provides an overview of the cryosphere in the Antarctic. Learn about Antarctic features such as clouds, glaciers, ice streams, ice shelves, and icebergs. In addition, explore how rising temperatures affect the region, for example by increasing the number of meltwater ponds, wh