Time for some adventure! We're going to take an exciting journey through the sea ice. We'll start by flying 20,000 m up in the air. As you zoom in closer and closer, we'll come crashing down to the surface of the ice. We won't stop there, though; you'll even get to go inside the ice. Usually, only scientists with high-tech equipment get to see the ice this closely. To continue your adventure, read the caption and then choose your destination.
This picture is 0.001 m (or 1 mm) across. This photograph was taken with a camera attached to a microscope. This is an air bubble. The air bubbles form as the ice freezes.