Question

Why should you roll or belly-crawl rather than walk across a thinly-frozen pond?

a) Walking increases pressure on ice.
b) Rolling spreads weight evenly.
c) Belly-crawling minimizes friction.
d) Thin ice is not affected by movement.

Answer 1

When walking across a thinly-frozen pond, the pressure exerted on the ice can cause it to crack and break. Rolling or belly-crawling spread weight more evenly and reduce the chances of ice breaking.

Step-by-step explanation:

During winters, a layer of ice forms on the water surface as ice is less dense than water. Water is densest at 4°C and retains its liquid form below the water surface, where the ice layer is. In liquid water, the aquatic life can survive using the resources available. When walking across a thinly-frozen pond, the pressure exerted on the ice increases, which can cause the ice to crack and break. However, if you roll or belly-crawl, your weight is spread evenly, minimizing the pressure on the ice and reducing the chances of it breaking.