Jason Tolsen, age 13, of St. Augustine, Fla., for his question:

WHAT IS A KETTLE HOLE?

A kettle hole is a bowl shaped hollow in loose rocks that has been left behind by a melting glacier.

When a glacier melts, large pieces of ice become separated from the main body of the glacier. These leave holes where they have rested.

Most kettle holes are from 100 to 500 feet across and from 30 to 50 feet deep. Many are found in the northeastern part of the United States and in southeastern xpart of Canada.

Glaciers covered a large part of northern North America during the Ice Age. It was during this period of time that most of the kettle holes were formed. Many kettle holes became filled with water and lakes were formed. Others turned into small swamps.

Kettle Moraine State Forest is one of the many interesting geological formations in the Great Lakes plains area. This Wisconsin spot is dotted with kettle lakes. After the glaciers retreated, blocks of buried ice were left behind and they melted to form these lakes.