Educators

Plant Morphology

Online Resource

Plant Morphology

From leaf margin and arrangement to the parts of a flower and a corn seedling, take an illustrated look at plant morphology with this collection of guides.

Who Are the Plants?

Article

Who Are the Plants?

There are 10 divisions in the plant kingdom. The largest order, flowering plants, has 235,000 species. The smallest, gingkoes, has a single species. Learn more about the orders in the kingdom Plantae.

Seasonal Cycle

Interactive

Seasonal Cycle

If the Earth turns all the way around every 24 hours, then why are some days longer than others? And why do we have winter and summer? See the answers for yourself—in a matter of seconds.

Dispatch from the Deep: Home Again

Article

Dispatch from the Deep: Home Again

From Pennsylvania to the Pacific Ocean and back again. Experience the final day of an expedition to study deep sea vents with this eyewitness account, and learn what came of the research.

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