What are the two main processes scientists use to measure the age of Earth and its parts?

The best estimate for Earth's age is based on radiometric dating of fragments from the Canyon Diablo iron meteorite . From the fragments , scientists calculated the relative abundances of elements that formed as radioactive uranium decayed over billions of years .

true. earthquakes are felt whenever there is a slip around a fault in the rocks below the earth. this reorientation of faults create sesmic waves and is known as earthquake, the severity of which is measured in richter scale. these are more prominent in hilly regions as the rocks usually form faults to balance the pressures on it.