A drumlin is a smooth, elongated hill formed by the movement of glaciers. These hills are typically made of sediment and are shaped like a teardrop, with the pointed end facing the direction the glacier moved. Drumlin fields can be found in areas that were once covered by ice, and they provide important clues about past glacial activity. Drumlins are often found in groups, creating what is known as a drumlin field. They can vary in size and height, and studying them helps scientists understand the dynamics of glaciers and their impact on the landscape. The study of drumlins is part of the broader field of glaciology, which examines glaciers and their effects on the Earth.