ocean acidification surface pH remains alkaline

The ocean is becoming less alkaline, not literally acidic

Average surface ocean pH fell from about 8.15 to 8.05 between 1950 and 2020. This is called ocean acidification because the pH is falling. But seawater is still slightly alkaline rather than actually acidic.

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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ocean acidification surface pH remains alkaline

The ocean is becoming less alkaline, not literally acidic

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