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Lesson Plan
Curated OER

Planet Earth in Cross Section

For Teachers 8th - 10th
Students will examine the layers of the Earth. In this geology lesson, students create a scale model of the Earth's interior using cash register tape. They will determine the percentage of error in the scale compared to the actual size...
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Lesson Plan
Curated OER

Chors, Secants, Tangents

For Teachers 9th - 12th
High schoolers identify the relationship between chords, secants and circles. In this geometry activity, students calculate the length of the chords. They sketch the secant lines on a circle.

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