General Geology_Class_04_Dr. Haridas Mohanta.pptx

Geology notes

1. General Geology Dr. Haridas Mohanta Department of Earth Sciences Sambalpur University, Jyoti Vihar, Burla

2. Slide 2 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology What is the age of the Earth? Age of Earth 4.543 billion years Or 5000000 million years Or 5 billion ± 1.5 billion years

3. Slide 3 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Methodology Direct Method Indirect Method Age of Earth

4. Slide 4 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Age of Earth Hindu Cosmology One day of Brahma is 4.32 billion human years 4.32 billion human years Puranas Indirect Method

5. Slide 5 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Age of Earth Change in Temperature Duration to condense to form Sun from gas nebula 20 billion years Astronomy Indirect Method

6. Slide 6 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Age of Earth Physics Lord Kelvin, German (1862) Change in Thermal gradient Duration for cooling of Earth 20 billion years Indirect Method

7. Slide 7 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Age of Earth Geology Charles Lyerll Sediment accumulation Duration for sediment layer creation 100 million years Indirect Method

8. Slide 7 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Age of Earth Geology John Jolly, 1899 Salinity Duration for salt accumulation 80-150 million years Indirect Method

9. Slide 9 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Age of Earth Chemistry D irect Method Clair Cameron Patterson, America, 1922 Radioactivity (Half life period) Duration of decay of radioactive isotopes Carbon , Uranium , Potassium, Lead etc. 4.55 billion years

10. Slide 10 Dr. Haridas Mohanta, Earth Sciences, Sambalpur University General Geology Source: theplanets.org Age of Earth Other methods Tree rings Ice cores Fossil records

11. Unit-2 Next class…….