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Handout
Ohio State University

Ohio State Univ.: Cell Expansion and Differentiation

For Students 9th - 10th
This essay is complemented by useful illustrations of how plant cells enlarge after mitosis and become specialized for different functions. A good supplement to plant growth studies.
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Article
USA Today

Usa Today: Understanding Air Density and Its Effects

For Students 9th - 10th
In simple terms, density is the mass of anything - including air - divided by the volume it occupies. In the metric system, which scientists use, we usually measure density in terms of kilograms per cubic meter. The air's density depends...
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Handout
University of Illinois

University of Illinois Urbana Champaign: Observed Dew Point Temperature

For Students 9th - 10th
Describes what dew point is and how it relates to moisture content of the air. Also explains condensation and relative humidity.

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