Unlike most glaciers worldwide, Johns Hopkins is advancing rather than retreating, thanks to a terminal moraine—a natural barrier of sediment at its base that slows melting by insulating the ...

The different types of moraine include terminal moraine, which marks the end of an ice sheet or valley glacier, and lateral moraine, which forms at the edge of a glacier at the valley side.

Glacial lakes form when meltwater is trapped behind a dam, usually glacial ice, bedrock or a type of moraine (terminal types being an unconsolidated pile of debris at the maximum extent of the ...