Final answer:
A drumlin is a smooth, elongated hill with a tapered shape formed by glacial movement, typically composed of till.
Step-by-step explanation:
A drumlin is a smooth, elongated hill with a streamlined shape that is formed by glacial action. Drumlins are part of the glacial landscape and are composed of till, which is the debris of glacial material. They have a characteristic shape, often described as resembling an inverted spoon or the shape of a half-buried egg, with the tapered end pointing in the direction of glacial movement. Drumlins do not have jagged, steep cliffs like mountainous formations, nor are they large flat plateaus with multiple peaks, and they are certainly not deep, narrow trenches in the Earth's crust.
Drumlins are formed underneath glaciers as they move across the landscape, shaping the underlying material into these streamlined hills. Geologic structures like drumlins tell us about the past movement of glaciers and the forces that have shaped our planet's surface. This knowledge is crucial for understanding patterns seen on Earth as well as on other terrestrial planets that exhibit similar geological characteristics.