Vocab
Isotope Used to date organic material.
What is Carbon-14?
The age of the earth.
What is 4.6 Billion years?
What needs to happen to an organism when it dies in order to become a fossil.
It needs to be buried. FAST!
Law that tells us the layers on the bottom are older.
What is superposition?
If you start of with 400g of a isotope how much would you have after 3 Half lives?
50g
An event that kills of most of the planets organisms.
What is a mass extinction?
True or False
Humans have been on earth for most of the 4.6 billion years.
What is False?
The type of rock we find fossils in.
What is sedimentary?
If a layer is cut by a fault, which is older.
What is the law.
The layer is older than the fault.
Law of cross cutting
You have 50 g of an isotope at the end of 4 half lives. How much did you have at the start?
800g
Timeline of the earths history divided into sections.
What is the geologic time scale?
The era know for mammals being the dominant.
What is Cenozoic?
The part of an organism that will most likely become a fossil.
What is the bones/ hard parts.
If a portion of rock is missing due to erosion we call it a...
Unconformity
If you have 12.5 percent of an isotope remaining how many half lives have happened.
3 half lives
Earths largest and oldest division of time.
4.6 billion-539 million years
What is the Precambrian eon?
The event that killed the dinosaurs.
What is the asteroid impact?
Photo Question:
Which of the following fossils would be a good index fossil.
What is C.
Photo question.
Which layer is older B or D?
Layer B is older
lower down
Photo Question:
How Long is 1 half life
8 Days
Theory that states the way geologic events happen today is the same as how they happened in the past
What is Uniformitarianism?
In order for birds and mammals to become dominant on earth what had to happen to the dinosaurs?
They needed to be killed off.
The three charactoristis a fossil needs to be a index fossil.
1. Abundant
2. Widespread
3. Short Lived
Photo Question:
Put the layers in order from oldest to youngest
Double points.
Y,T,E,Q,C,H,N,P,V
Photo Question:
How much remains after 2 half lives
4000