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In this three/four-day lesson, learners calculate perimeters and areas and draw the castle plan to scale.

In this group activity, learners will mark important developments of life on Earth on a timeline (each foot in length representing 200 million years).

In this activity (on pages 16-21), learners get a sense of geological time by understanding how big a million is.

In this activity, learners investigate the history and development of agricultural biotechnology.