Relative Age
Most fossils form in this type of rock.
What is sedimentary rock?
This process tells us the actual age of rocks or fossils in years.
What is Absolute Age/dating
Earth's geological history on a chronological chart.
What is the geologic time scale?
This is most likely the final thing that caused Dinosaurs to became extinct.
What is a meteor?
Scientist use the fossil record to put together this.
What is the geologic time scale.
This is the other method of determining an age of a fossil that is not exact.
What is Relative Age?
A cold period when glaciers covered the Earth
What is the Ice Age?
This Era is known as "early life".
What is the Paleozoic?
The extinction of many species in a short period of time?
What is mass extinction?
Scientists measure this to determine the exact age of fossils.
What are radioactive isotopes?
This is how long ago the Earth was formed.
What is 4.6 billion years?
This Era is called "middle life" and included dinosaurs?
What is the Mesozoic?
Sometimes telling the relative age of rocks is not as simple as looking at the layers because the crust can do this over the course of time.
What is a distrurbance?
These are footprints or burrows left by ancient organisms .
What are trace fossils?
This is the amount of original element left after the first half-life passes.
What is 50%?
This was the longest Era.
What is Precambrian?
We are currently living in this Era.
What is the Cenozoic?
This is when a piece of older rock becomes part of a newer rock.
What is an inclusion?
The soft parts of organisms decay quickly, but fossils form out of the harder parts of the organism. Give an example.
What are teeth, bones, shells, seeds, wooden stems.
This is the time it takes for half of the mass of an original element to change into a new product.
What is half-life?
This is the largest division of geologic time.
What is Eon?
This is the amount of major mass extinctions that Earth has experienced.
What is 5?