The numeric age of rock or the age in years
What is Absolute age
only useful for rocks formed within the past 10,000 to 20,000 years
What is rate of erosion
What are ice cores formed from?
What is glacial ice?
the time it takes for half a sample of a radioactive isotope to decay
What is half life?
If you had 200 gram sample of Carbon-14, how much would you have left after 11,460 years?
The half life time of carbon-14 is 5730 years.
What is 50 grams?
using organic remains to date objects
What is radiocarbon dating?
an example of rate of erosion
What is a stream eroding its bed
Where do varves form?
What are glacial lakes
Does the rate of decay change? For example, Potassium-40, does its half life time every change?
What is NO?
What is the half life of Mercury-203?
What is 50 days? (Will accept 46-50 days)
atoms of the same element that have different numbers of neutrons
What is an isotope
how much rock is deposited on average
What is 30 cm of rock in one thousand years
How many years of deposition (layers) are represented in a single varve?
What is 2?
what do you divide by to find how much decays to the daughter?
What is 2?
What is the ratio of parent atoms to daughter atoms at 3 half lifes? (parent:daughter)
What is 10:90?
the material formed as a result of decay
What is a daughter isotope?
Type of rate that is good for very old exposed sediment
What is rate of deposition?
What are varves & ice core counting similar to?
What is counting rings on a tree trunk
What is the difference between the parent and the daughter isotope?
What is the parent is the original and the daughter is the newly created?
HOW MUCH would remain after 6 half lives if an isotope has a half life of 250 days and the starting sample was 125 grams?
What is 1.953 grams?
The breakdown of an unstable atom (isotope) by decay
What is radioactive Decay
why does rate of deposition or erosion only provide an estimate?
What is the rate may vary over extended periods of time
What are the 5 methods of absolute age dating?
100 points per correct answer.
DAILY DOUBLE: You get double the points if you can name all 5 correctly with correct spelling!!
What is radioactive decay, varves, ice cores, rates of erosion and rates of deposition?
RadioCARBON dating is only good up to how many years?
What are objects less than 70,000 years old?
HOW OLD is a rock if it contains 3.375 grams of Carbon and the parent isotope started at 54grams? Carbon's half life is 5730.
What is 22930 years?