What is the oldest object on earth?

Determining the absolute oldest object on Earth is challenging due to the dynamic nature of the planet's geology and the continuous processes of erosion, volcanic activity, and tectonic movement that constantly reshape the Earth's surface. However, some of the oldest objects found on Earth include:

Zircons: Zircon crystals found in Western Australia's Jack Hills region are among the oldest known materials on Earth, with some dating back approximately 4.4 billion years. These zircons provide valuable insights into the early history of the Earth's formation and the conditions that existed during the planet's infancy.

Acasta Gneiss: The Acasta Gneiss, located in the Northwest Territories of Canada, is one of the oldest known exposed rocks on Earth. It is estimated to be around 4 billion years old, making it one of the earliest remnants of the Earth's continental crust.

Meteorites: Certain meteorites that have fallen to Earth from space contain materials that predate the formation of the Earth itself. Some meteorites, such as those from the asteroid Vesta, have been dated to over 4.5 billion years old, providing insights into the early stages of the solar system's formation.

Banded Iron Formations (BIFs): Banded Iron Formations found in various locations around the world contain some of the oldest sedimentary rocks on Earth, dating back over 3 billion years. These formations provide evidence of early atmospheric and geological conditions on Earth, including the presence of oxygen and the development of life.

While these objects provide valuable insights into the Earth's early history, it's important to note that the concept of "oldest" can vary depending on the criteria used for measurement (e.g., age of the Earth itself, age of specific geological formations, age of individual minerals or crystals). Additionally, new discoveries and advances in scientific dating techniques may lead to revisions and updates in our understanding of the Earth's ancient past.