One Crater, Two Colors

From high in the sky, Polly looked down into one huge crater. It was more than twenty-two thousand years old and big enough to hold a small town and two lakes. A strip of land crossed the middle. On each side, the water was a different color: one lake blue, one lake green.

The two lakes are really one piece of water, joined by a channel under the land. But everything around them looks different. The blue lake is deeper and reflects the sky. The green lake sits near plants and tiny algae, which turn its color green.

Polly flew low along the strip of land between the colors. She saw fishing boats on one side and cows on the hills above the other. Thick fog rolled in and covered first the green lake, then the blue one.

She sat on an old stone wall and waited for the fog to clear. When it did, both lakes were still there, blue and green, just as before.