单语范例（未经PONS编辑处理）
This rich soil is the result of constant flooding during the retreat of glaciers during the last ice age, about 12,000 years ago.
en.wikipedia.org We know that with the end of the last ice age, a period of warming occurred lasting from 18,000 to 10,000 years ago.
en.wikipedia.org This was formed following the retreat of ice age glaciers which left the area dotted with kettle holes, locally referred to as meres.
en.wikipedia.org As the climate warmed at the end of each ice age, great successional changes took place.
en.wikipedia.org The glacier is a remnant of the massive glaciers that formed during the last ice age.
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