Examlex
Penicillin selection is a positive selection for the isolation of mutants with growth factor requirements.
Terminal Moraine
A terminal moraine is an accumulation of debris and sediment formed at the snout (end point) of a glacier, marking the furthest advance of the glacier.
Cirque
A mountain basin with steep sides and a bowl-like shape, formed by glacier activity, frequently hosting a small lake.
Moraine
A mass of rocks and sediment carried down and deposited by a glacier, typically as ridges at its edges or extremity.
Valley
A low area between hills or mountains, often with a river or stream flowing through it.
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