What are ice cores?

Ice cores are like time capsules made from ice, showing us what Earth was like a long time ago.

Imagine you have a big jar full of layers of different kinds of cookies, one layer is chocolate chip, another is sugar cookie, and so on. Each layer tells you something about when it was added. Now think of an ice core as that jar, but instead of cookies, it has layers of ice. These layers were made over many years, sometimes even thousands of years!

Every year, in places like Antarctica or Greenland, snow falls and turns into ice. As the snow builds up, it presses down on the older layers below, turning them into thick sheets of ice. Each layer holds clues about the weather, the air, and even the plants that lived back then.

Scientists drill deep into these ice sheets, taking out long tubes of ice, like giant straws full of frozen history! By studying the layers, they can tell us what the temperature was, how much carbon dioxide was in the air, and even what kinds of plants were around. It’s like reading a storybook written by Earth itself!