aluminum crust abundance compared with whole Earth

Aluminum is far more common in Earth's crust

Aluminum makes up 8.23% of Earth's crust by mass, but only 1.59% of Earth as a whole. Its strong attraction to oxygen keeps much of it bound in oxygen-rich minerals in the crust.

The Sun and Moon nearly match in size

The Sun and Moon appear nearly the same size in Earth’s sky because the Sun is about 400 times wider but also about 400 times farther away. This alignment allows both total and annular solar eclipses.

Ravens may hide food based on what another raven can see

Ravens protect hidden food when a stronger rival can watch them. They also protect it when they can hear the rival nearby through a small opening but cannot see it directly. This suggests they may keep track of what another raven is able to see.

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aluminum crust abundance compared with whole Earth

Aluminum is far more common in Earth's crust

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