Final answer:
A drumlin is an elongated hill shaped like an inverted spoon, created by the action of a glacier on sediment, indicative of past glacial directions.
Step-by-step explanation:
“Elongated hills in the shape of an inverted spoon, formed by the advance of a glacier acting on the underlying unconsolidated material” describes a drumlin. A drumlin is a streamlined, elongated hill formed by glacial ice acting upon unconsolidated sediments, shaping them into a whaleback form with the steeper side facing the direction from which the ice came and a tapered side facing its direction of movement. Drumlins often appear in clusters called drumlin fields and are typically composed of till, a mixture of clay, silt, sand, and gravel. They help in deducing the direction of past glacial movement, providing valuable information about the direction a glacier was originally traveling before it retreated.