Science!

To answer the question, “How does sea-floor spreading add material to the ocean floor?”
Mrs. Murphy’s Earth Science class built models. The earth is continually involved
in the processes of sea-floor spreading and subduction. Sea-floor spreading happens
when molten material rises from the mantle and erupts at a mid-ocean ridge. The
molten material spreads out, cools, and pushes older rock farther away from the ridge.
Meanwhile, subduction takes place at deep-ocean trenches, where the ocean floor sinks
down and pushes back into the mantle. It’s a continual process. Directly observing this
activity would be very difficult. By building and using models, students are able to help
themselves understand the concepts. The step-by-step process was a little tricky, but as
you can see in the photos, everyone in Grades 6,7, and 8 was quite successful.

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