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How does the glaciation process occur and what influences its cyclicity?

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Glaciation occurs when temperatures decrease, causing snow and ice to accumulate and advance, forming glaciers. This process is influenced by various factors such as changes in Earth's orbit and tilt (Milankovitch cycles), variations in solar radiation, levels of greenhouse gases in the atmosphere, and ocean currents. The cyclicity of glaciation is mainly driven by these factors interacting with each other over long periods of time.