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 our understanding of Earth's geological history, as we have become aware of our planet's ever-changing nature. This video is available in both English and Spanish audio, along with corresponding closed captions. CREDITS: https://www.pbslearningmedia.org/credits/ess05.sci.ess.earthsys.plateintro/ LICENSE: https://www.pbslearningmedia.org/help/full-license-for-section-3c-of-terms-of-use-download-and-share/#.X0N9HsgzaUk

LicenseCustom License

More videos by this producer

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