Vocabulary
Rate of Erosion/Deposition
Varves & Ice Cores
Half-Life
MATH/GRAPHS
100
The numeric age of rock or the age in years
What is Absolute age
100
only useful for rocks formed within the past 10,000 to 20,000 years
What is rate of erosion
100
What are ice cores formed from?
What is glacial ice?
100
the time it takes for half a sample of a radioactive isotope to decay
What is half life?
100
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?
200
using organic remains to date objects
What is radiocarbon dating?
200
an example of rate of erosion
What is a stream eroding its bed
200
Where do varves form?
What are glacial lakes
200
Does the rate of decay change? For example, Potassium-40, does its half life time every change?
What is NO?
200
What is the half life of Mercury-203?
What is 50 days? (Will accept 46-50 days)
300
atoms of the same element that have different numbers of neutrons
What is an isotope
300
how much rock is deposited on average
What is 30 cm of rock in one thousand years
300
How many years of deposition (layers) are represented in a single varve?
What is 2?
300
what do you divide by to find how much decays to the daughter?
What is 2?
300
What is the ratio of parent atoms to daughter atoms at 3 half lifes? (parent:daughter)
What is 10:90?
400
the material formed as a result of decay
What is a daughter isotope?
400
Type of rate that is good for very old exposed sediment
What is rate of deposition?
400
What are varves & ice core counting similar to?
What is counting rings on a tree trunk
400
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?
400
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?
500
The breakdown of an unstable atom (isotope) by decay
What is radioactive Decay
500
why does rate of deposition or erosion only provide an estimate?
What is the rate may vary over extended periods of time
500
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?
500
RadioCARBON dating is only good up to how many years?
What are objects less than 70,000 years old?
500
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?