Earth Science History

Earth Science History

1. Bombardment

   • About 4 to 3.8 billion years ago a period of intense comet and asteroid bombardment is thought to have peppered all the planets including the Earth.

2. Geological Time Scale

   • used by geologists and other scientists to map the timing and relationships between events that have occurred during the history of the Earth.

3. Layers of the Earth

   • The Earth consists of four concentric layers: inner core, outer core, mantle and crust. The crust is made up of tectonic plates, which are in constant motion.

4. Stratigraphy

   • branch of geology concerned with the order and relative position of strata and their relationship to the geological time scale.

5. Fossil Records

   • Fossil record, history of life as documented by fossils, the remains or imprints of previous living ,from earlier geological periods preserved in sedimentary rock.

6. Relative Dating

   • Relative dating is the science of determining the relative order of past events ,meaning how old the layers of rock are.Typically, the oldest rocks are all the way in the bottom.

7. Absolute dating is the process of determining an age on a specified chronology in archaeology and geology. Some scientists prefer the terms chronometric or calendar dating, as use of the word "absolute" implies an unwarranted certainty of accuracy.

   • Absolute Dating

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