Investigating Trenches Students explore the location of undersea trenches, then try to notice patterns between trenches and mountains, earthquakes or volcanoes. Activity 12D Exploring Magnetic Forces Students will explore magnetic forces and how this affects the movement of magnetic material. This activity provides background to understand magnetic reversals. The Spreading Sea Floor Students make a model of sea floor spreading that includes magnetic reversals and the age of rocks. An animation of sea floor spreading with a description of each of the stages.
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