Ice Ages: Cycles of Climate Change

Ice Ages are extended periods of Earth's history when global temperatures dropped dramatically, causing massive glaciers to expand across continents. The most recent ice age, known as the Last Glacial Maximum, peaked approximately 20,000 years ago, with ice sheets covering up to 30 percent of Earth's land surface.

Major Ice Age Events

• Pleistocene Epoch (2.6 million to 11,700 years ago) - featured multiple glacial cycles across North America, Europe, and Asia
• Younger Dryas (12,900 to 11,700 years ago) - a sudden cooling period that halted post-glacial warming
• Holocene Interglacial (11,700 years ago to present) - the warm period enabling human civilization development

Scientists studying ice cores from Greenland and Antarctica discovered that ice ages correlate with variations in Earth's orbital cycles, a theory developed by Milutin Milankovitch in the 1920s. The Vostok Ice Core, extracted in Antarctica during 1998, revealed 420,000 years of climate history preserved in frozen layers.

During ice ages, sea levels dropped approximately 120 meters as water accumulated in glaciers. The Cradle of Humankind in South Africa shows how early humans adapted to these dramatic climate shifts. Understanding ice age cycles helps scientists predict future climate patterns and comprehend how environmental change drives evolution and human migration.

Reference:

Wikipedia reference

https://en.wikipedia.org/wiki/Ice_Ages