In this activity students are asked to interpret a graph that represents the sunspot cycle from 1900 to 1990, then they are asked to graph the number of sunspots that occurred from 1995 to 2003 in order to understand...
What, some ask, was the "last extinction?" It's a fair query indeed, and it happens to be understood as the period approximately 13,000 years ago when large animals were killed off across the North American continent....
This lesson, based on the NOVA television broadcast 'The Day the Earth Shook', introduces students to engineering for earthquakes; specifically, architectural features that work and those that don't. The objective is to...
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