Science Fair

Alexa Hinzman

Why is the center of a pingo pure ice?

My hypothesis is:

That a lake has permafrost under it when a lake freezes the permafrost pushes the lake up to from a hill. Then winds push dirt onto the hill-shaped lake and over time a pingo is formed.

1. The first one I did was when I took a plastic bowl and a baseball. I took some sand and poured it into the bowl. Then I made an indentation with the baseball. Next I poured water into the bowl and hole. I put it outside to freeze.

2. The next one I did was that I made a smaller hole into the plastic bowl and I put more water into the hole and bowl than the first one. Than I put a towel over the bowl and put it into the freezer.

3. In the third experiment I did I got a metal bowl and put a small hole into the sand. I put the most water than all my experiment into the bowl and hole. I than put it outside.