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Rare earth elements are difficult to extract and refine. Although most of them currently come from China, they are essential for the goods we take for granted in the modern world.
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Using scientific method to test hypotheses about musical sand dunes.
It is an educational content of CK-12 Foundation (to access some of the CK-12 contents you must be logged in).
Using scientific method to ask and answer questions about moving rocks.
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Evolution has created millions of species, all unique. This has resulted in the tremendous biodiversity we see on Earth.
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Miniscule changes over enormous periods of time will lead to remarkable differences in Earth and its environment.
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The moon appears much larger on the horizon than it does high in the sky. The reason has perplexed people for millennia.
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The oldest star in that we see in the Milky Way Galaxy formed not long after the Big Bang.
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Earthquake magnitude is measured on a logarithmic scale so each whole number releases 33 times more energy than the number below it.
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Find out the ingredients for dangerous landslides and how the San Francisco Bay Area is prone to these disasters.
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Above the Arctic Circle, the sun never sets during the six month summer and never rises during the six month winter.
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