What is the meaning of the word "ice age"?

Definitions:

  1. A long period of time when the Earth's surface and atmosphere are colder than usual. copy to clipboard NOUN
    • The harsh conditions of the Ice Age fostered the evolution of specialized adaptations in organisms. copy to clipboard
  2. Any geological period during which thick ice sheets cover vast areas of land. copy to clipboard NOUN
    • Ice Age caps and glaciers contained significant amounts of the Earth's freshwater supply. copy to clipboard
  3. Is a period of long-term reduction in global temperatures, resulting in the expansion of ice sheets, glaciers, and polar ice caps. copy to clipboard NOUN
    • The end of the Ice Age marked a period of widespread ecological and environmental change. copy to clipboard

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