1. Ice cores
Nature’s time machine

2. What is an Ice Core?
A core sample of ice that is removed from an ice sheet or glacier.

3. What do ice cores tell us about the past?
Radioactivity
Snow in the south pole contains radiation from the Chernobyl meltdown.
Air Pollution
GASES trapped in ice cores spike after the Industrial Revolution.

4. What do ice cores tell us about the past?
Volcanic eruptions
ash, dust and sulfur collect in the air causing a much colder climate
Sea storminess
Salt in the air is trapped in ice cores after big sea storms

5. What do ice cores tell us about the past?
Temperature and climate
Gases trapped in ice cores show temperature fluctuations and climate change like ice ages and warmer periods.
Global Warming
Carbon dioxide levels increase leading to global temperatures also increasing.