题目内容
An ice age is period of long-term reduction in the temperature of Earth＇s surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers.
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Glaciation is the formation, movement, and recession of glaciers or ice sheets in a period of time.
A/an is an elongated hill in the shape of an inverted spoon or half-buried egg formed by glacial ice acting on underlying unconsolidated till or ground moraine.
An/a is a long, winding ridge of stratified sands and gravels deposited by subglacial meltwater streams, occurred in glaciated and formerly glaciated regions of northern hemisphere.
Glacial striations are scratches or gouges cut into bedrock by glacial abrasion.
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