Which allowed scientists to determine that Eart was at least 4.3 billion years old?

Answer 1

Scientists were able to determine that Earth was at least 4.3 billion years old through the study of rocks and minerals. By analyzing the composition and age of these materials using radiometric dating techniques, scientists were able to establish the age of the oldest known rocks on Earth, which provided evidence for the planet's age. Additionally, the discovery of meteorites that have been dated to around 4.6 billion years old further supported the estimate of Earth's age.