Cave pearls form when water drips onto a grain of sand, depositing concentric layers of calcite over thousands of years.
Fact #7417
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More Human Body Facts
The human stomach can expand significantly after a large meal.
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The human body glows faintly in complete darkness.
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Water covers more than 70% of Earth's surface.
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The human body produces red blood cells in bone marrow.
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The average adult human has 32 teeth.
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The human brain continues to develop into early adulthood.
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A horned lizard can squirt blood from its eyes as a defense.
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The Earth is not perfectly round.
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