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This is an activity about the conditions for a sustainable biosphere. Learners will build a biosphere that is a balanced, self-enclosed living system able to run efficiently over a long period of time. This activity is in Unit 3 of the Exploring the... (View More)

This is a lesson about impact craters; the relationships between crater size, projectile size and projectile velocity; and the transfer of energy in the cratering process. Learners will create plaster of Paris or layered dry impact craters and... (View More)