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As a model of acid rain, learners water plants with three different solutions: water only, vinegar only, vinegar-water mixture.

An estuary is a body of water that is created when freshwater from rivers and streams flows into the saltwater of an ocean.

This activity (page 2 of the PDF under SciGirls Activity: Bogs) is a full inquiry investigation into decomposition.

In this indepth hands-on activity, learners build a structure that allows them to observe the growth of roots and the correlation between root growth and stem extension.