Teacher resources and professional development across the curriculum
Teacher professional development and classroom resources across the curriculum
Learner Express: Modules for Teaching and Learning
Dr. Sherilyn Williams-Stroud, senior research scientist at ChevronTexaco Energy Technology Company, observes sediments within a stream in the Appalachian Mountains. Scientists have measured the Appalachian Mountains to be 300 to 500 million years old and the Himalayan mountains to be approximately 40 million years old. Because the Appalachian Mountains are much older than the Himalayas, one might expect them to be shorter. Teacher Joe Reilly explains that mountain-building processes are not continuous in all sites around the world. Meanwhile, the process of erosion continually removes sediment and reduces the height of mountains. This is the reason that the Appalachians are so much lower and less rugged than other mountains, such as the younger Himalayas. Run Time: 00:02:34
Grades 5-8 Standard A. Science as Inquiry: Think critically and logically to make the relationships between evidence and explanations.
Standard D. Earth and Space Science: Landforms are the result of a combination of constructive (sedimentation, volcanoes) and destructive forces (weathering and erosion).