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

In this activity, learners discover the relationship between temperature and pressure in the lower atmospheres of Jupiter and Earth.

In this activity, learners build edible models of Jupiter and Earth to compare their sizes and illustrate the planets' internal layers.

Learners observe and discuss a simple model of a wet scrubber, a device for cleaning industrial air pollution.

Water on Earth is in lakes, the ocean, rivers, underground, and frozen glaciers.