global glaciation

Global glaciation, also known as a "Snowball Earth," refers to periods in Earth's history when ice sheets expanded far beyond the polar regions, covering much of the planet's surface with ice. This phenomenon results from a combination of factors such as climate feedback loops, reduced greenhouse gases, and changes in the Earth's orbit. The extensive ice cover drastically lowers global temperatures, creating a cooling cycle that reinforces itself. These events can last millions of years and have significant impacts on Earth's climate, sea levels, and ancient life. Understanding glaciation helps scientists learn how Earth's climate has changed over geological time.