10 Time

TIME : TIME How old is Earth?


TIME : TIME How old is Earth? Begun in 4004 BC?


TIME : TIME How old is Earth? begun in 4004 BC? begun at 8:00 this morning?


TIME : TIME How old is Earth? begun in 4004 BC? begun at 8:00 this morning? Early methods of dating


TIME : TIME How old is Earth? begun in 4004 BC? begun at 8:00 this morning? Early methods of dating rate of sedimentary deposition


TIME : TIME How old is Earth? begun in 4004 BC? begun at 8:00 this morning? Early methods of dating rate of sedimentary deposition salt in ocean


TIME : TIME How old is Earth? begun in 4004 BC? begun at 8:00 this morning? Early methods of dating rate of sedimentary deposition salt in ocean temperature of Earth


TIME : TIME RADIOMETRIC DATING radioactive isotopes - proton/neutron ratio decay to more stable elements


TIME : TIME RADIOMETRIC DATING radioactive isotopes - proton/neutron ratio decay to more stable elements decay is CONSTANT, not changed by temperature or pressure or chemical reaction


TIME : TIME RADIOMETRIC DATING radioactive isotopes - proton/neutron ratio decay to more stable elements decay is CONSTANT, not changed by temperature or pressure or chemical reaction time elapsed is based upon ratio of undecayed atoms to daughter atoms


TIME : TIME RADIOMETRIC DATING EXAMPLE A-->B half life of 10 my A B Time 100% 0% t=0


TIME : TIME RADIOMETRIC DATING EXAMPLE A-->B half life of 10 my A B Time 100% 0% t=0 50% 50% t =10my


TIME : TIME RADIOMETRIC DATING EXAMPLE A-->B half life of 10 my A B Time 100% 0% t=0 50% 50% t=10my 25% 75% t=20my


TIME : TIME RADIOMETRIC DATING EXAMPLE A-->B half life of 10 my A B Time 100% 0% t=0 50% 50% t=10my 25% 75% t=20my 12.5% 87.5% t=30my


TIME : TIME Types of radiometric dating Carbon 14 constant level of C14 in living things when die, no longer accumulate half life of about 5700 years


TIME : TIME Types of radiometric dating 14C Potassium-Argon 40K-->40Ar


TIME : TIME Types of radiometric dating 14C Potassium-Argon 40K-->40Ar potassium very common in rocks half life of about 1.3 billion years


TIME : TIME Types of radiometric dating 14C Potassium-Argon 40K-->40Ar potassium very common in rocks half life of about 1.3 billion years argon is a gas and may escape above 125 C potassium argon ages are MINIMUM dates


TIME : TIME Types of radiometric dating 14C Potassium-Argon 40K-->40Ar Rubidium-Strontium 87Rb-->87Sr half life of 48 billion years isochron the most common method


TIME : TIME Types of radiometric dating 14C Potassium-Argon 40K-->40Ar Rubidium-Strontium 87Rb-->87Sr half life of 48 billion years isochron the most common method several samples from rock body to be dated Rb-->Sr increasing the angle of the isochron


TIME : TIME Types of radiometric dating 14C Potassium-Argon 40K-->40Ar Rubidium-Strontium 87Rb-->87Sr Uranium-Lead 238U-->206Pb 235U-->207Pb


TIME : TIME Types of radiometric dating 14C Potassium-Argon 40K-->40Ar Rubidium-Strontium 87Rb-->87Sr Uranium-Lead 238U-->206Pb 235U-->207Pb 238 half life of about 4.5 billion years 235 half life of about 700 million years


TIME : TIME Nuclear fission tracks count tracks bombard to cause nuclear decay recount tracks good for dating objects less than 1my