Geologist Day is observed on the first Sunday in April each year, celebrating the contributions of geologists to our understanding of the Earth. This day highlights the importance of geology, a science that studies the materials, natural features, and processes of the Earth, as well as the history of all life that has existed. The first Geologist Day was established by scientists in the former Soviet Union. Geologists play a crucial role in revealing the Earth's over 4.5 billion-year history and the dynamic nature of the ground we walk on. Typical customs for this day include appreciation for the field of geology and promoting awareness of its significance in understanding Earth's past and future.