When mineral -
rich water drips from a cave's ceiling over centuries and millennia, it forms rocky cones that hold clues to the Earth's past climate.
When this mineral -
rich water drips into caves, it leaves mineral deposits behind that form layers which grow during wet periods and form dusty skins when the water dries up.
When mineral -
rich water drips from a cave's ceiling over centuries and millennia, it forms rocky cones that hold clues to Earth's past climate.