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Similarly to 2003 a power relay to prevent overload of the Northeastern grid is set off blacking out over 80,000 sq. miles of the US and some parts of Canada.
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This resource received a 3* rating because it is part of Unit 5: Forecasting the Future, which is part of the larger resource Earth Systems Science Curriculum. This larger resource received a rating of 3-Exemplary in the Curriki Review System. You can learn more about this larger resource by reading its review and comments.