HISTORY OF LIFE ON EARTH Physical conditions - last 4 billion years major changes: oxygen in atmosphere climate change ocean currents sea level changes.
History, Theory, Current Methods, Problems SRJC, Physics 43, Spring 2011 Aaron Krive, Kevin Chee.
Whats the oldest thing you have ever touched?. Evolution of Landforms and Organisms Continued – Part Two.
Dating with Radioactivity Chapter 12, Section 3. Basic Atomic Structure Each atom has a nucleus containing protons and neutrons and that nucleus is orbited.
Half-Life Pg. 870-874. Half-Life Half-life = the time needed for half of the radioisotope sample to decay into products Half-live can have varying lengths.
1.Relative age dating العمر النسبى It could be done by the following: a) Principle of superposition---Initial horizontality: In normal geologic section,
Grand Canyon in Arizona (stratification, bedding) stratification, bedding, stratum (strata) Rock Record and Geologic Time.
James Ussher (mid 1600's) Georges Buffon (mid 1700s) Lord Kelvin (late 1800's) 75,000 yr 100 m.y. Charles Walcott (1893) 75 m.y. 4004 B.C.
Fossils are usually formed when an organism is covered by sediments that then harden into sandstone, slate, mudstone or flint. Most organisms do not fossilize.
Fossils Lecture
Geology. The study of the solid Earth and the processes that shape it – Plate tectonics – Past climates – Natural disasters – Fossil Record – Evolution.
What’s the oldest thing you have ever touched?. Evolution of Landforms and Organisms.
