Description: The Little Ice Age: Climate Change - World History - Part 1 - Extra History, The Little Ice Age: No More Food - World History - Part 2 - Extra History, Climate Change, Chaos, and The Little Ice Age: Crash Course World History #206
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An ice age is a 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 . Within a long-term ice age, individual pulses of cold climate are termed " glacial periods " (or alternatively "glacials" or "glaciations" or colloquially as "ice age"), and intermittent warm periods are called " interglacials ". Glaciologically , ice age implies the presence of extensive ice sheets in the northe
In 1742 Pierre Martel (1706–1767), an engineer and geographer living in Geneva , visited the valley of Chamonix in the Alps of Savoy . Two years later he published an account of his journey. He reported that the inhabitants of that valley attributed the dispersal of erratic boulders to the glaciers, saying that they had once extended much farther. Later similar explanations were reported from other regions of the Alps. In 1815 the carpenter and chamois hunter Jean-Pierre Perraudin (1767–1858) explained erra
An ice age is a geologic period of major glaciation.