Sticking to the topic of science, how about ecosystems?

A dying ecosystem in North America is the prairie and this site is devoted to the topic. Along with lots of facts and pictures, there is also an interactive section where you attempt to create your own prairie.

Alternatively, look for the prairie chickens, birds, insects, or snakes. In addition to online activities and resources, the site also features a good collection of curriculum resources to complement the topics.

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