Dune

Definitions

1. A ridge or hill of sand piled up by currents of wind or water.
2. an island close to Heligoland

Equivalents

Examples

“Heavy line segments (lengthened for clarity) indicate⟳ locations of deep-sea dunes.”

“In the early 2000s, space probes [confirmed Mars as] having dunes […] Their shapes are identical to their Saharan cousins', but they are ten times bigger. In contrast, underwater dunes are a hundred times smaller than their counterparts on solid ground. This universality of dunes is a blessing for physicists: their comparative study⟳ confirmed the models that describe⟳ the formation of dunes on Earth.”

CEFR level