This interactive feature introduces viewers to the various types of caves, and describes Karst activity, the process by which naturally-occurring acidic solutions form cavities in soluble rocks. Other topics include...
Earth's surface has changed in countless ways during the 4.6 billion years since it formed, and it continues to change today. This video segment looks at some of the geologic processes that have shaped the landscape...
Early evidence showing striking similarities between regions on opposite sides of vast oceans suggested that in Earth's distant past what are now separate continents may once have been connected. However, this evidence...
In this activity, students construct a magnetometer from a magnet and a spring balance and use it to locate buried objects in a tray. The activity will reinforce the idea that local fluctuations in Earth's magnetic...
In this activity, students will familiarize themselves with ground water terminology, learn how hazardous materials contaminate ground water, and interview a professional working on problems of ground water...
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