to accurately date the earth and fossils. Some secular scientist believe that the Earth and universe from a process related to the Big Bang theory causing the Earth and the universe to form slowly over billions of years.
Uniformitarianism also date the Earth around 4.6 billion years old from the way sediments and layers of soil sediments have been layered. From the use of radioactive dating and the decay of daughter isotopes. Uniformitarianism rejects the scripture of God by the belief in the Big Bang Theory.
Catastrophism is events quickly and violently change the face of the Earth. Noah flood changed the face of the Earth burring sediments and fossils. Volcano eruption and violent earthquakes for thousands of years make global changes to the face of the Earth rapidly.