How Do Ice Ages Work?

Ice ages happen when Earth gets really cold for a long time, like a super-long winter that lasts thousands of years.

Think of Earth as a big, cozy blanket. When the sun shines more on one part of the blanket, it warms up, but sometimes the sun seems to take a nap, and less light reaches Earth. This is like when you pull your blanket over your head and feel cooler.

Carbon dioxide, which is like a little heater in the air, can go up or down. When there's not much of it, Earth cools off more easily, kind of like turning down the heat on your radiator.

When Earth gets cold enough, ice sheets start growing, like giant glaciers spreading across continents. These ice sheets are like big, slow-moving snowflakes that keep getting bigger and bigger. Over time, they can cover whole countries!

But when the sun wakes up again, or more carbon dioxide comes back into the air, Earth warms up, and the ice starts to melt, just like how your ice cream melts on a hot day.

Sometimes it takes a few thousand years for Earth to go from a snow globe to a warm summer, but that’s just part of its big, slow dance with the sun.