Students see an animation showing that the things around them are made of atoms and molecules. Students use Snap Cubes to make models of atoms and molecules. They are given white, red, blue, and black ...

This hierarchy—nitrogen > carbon > argon in core preference—may solve two mysteries. To quantify this, the researchers built a model of Earth's accretion 4.6 billion years ago. Suppose Earth ...

Nitrogen surrounds us, but understanding how it can be both a friend in agriculture and a foe in water was among the ...

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