Deep underground, hidden caves grow over thousands of years — carved by nothing but rain and rock!
Today you will become a cave detective. You'll find out:
🌧️ Why rain can melt rock • 🕳️ How a cave is hollowed out • 🪨 How those pointy rock spikes grow
Tap Next to begin your journey down, down, down…
As raindrops fall, they soak up a gas from the air called carbon dioxide. This turns the water into a very weak acid — far too weak to hurt you, but strong enough to slowly nibble at rock.
Make the acid! Tap the cloud to mix it.
Many caves form in a soft rock called limestone. The sour rainwater trickles into tiny cracks and slowly dissolves the rock away — like warm water melting sugar, but VERY slowly.
Drag the slider to fast-forward time and watch the cave grow.
Water trickling through the ceiling carries dissolved rock. When a drop hangs at the tip, a tiny ring of rock is left behind. Drop after drop, a stone icicle grows downward — a stalactite.
Tap the cave roof to drip water. Grow the stalactite to the goal line!
Not every drop stays on the ceiling. Some fall all the way down and splash onto the cave floor — leaving rock there too. A bump slowly rises upward. That's a stalagmite!
Tap the question mark on the floor to find out what grows there.
Use the memory trick: stalactite has a T for Top (ceiling). Stalagmite has an M for Mound on the ground.
A cave room takes a very long time to form. Why?
You followed a raindrop from the sky all the way to a deep, sparkling cave.
Remember: nature is a slow, patient artist — drop by drop, it builds wonders. 💧✨
Great work today. Next time you see a cave photo, you'll know exactly how it was made!