Show:
vocab
age-dating
extinctions
enviormental change
random
100
is mad up of all the fossils ever discovered on earth
What is the definition of fossil record?
100
scientists determine the relative order in which rock layers were deposited
What do scientists do in relative age dating?
100
extinction occurs when the last individual of a species dies
What is the definition of extinction?
100
individual orginisms of species might not be able to find the recources they need to survive
What happens after a change happens?
100
trapped
What is the definition of isolated
200
the impression of a organism in a rock
What is a mold?
200
relative age dating helps scientists determine the relative order in which species have appeared on earth over time
Why to scientists use relative age-dating?
200
mass extinction occurs when many species become extinct within a few million years or less
When does a mass extinction occur?
200
when the enviorment changes quickly
What is when can extinctions occur?
200
often not
will you find the same fossil in every layer of a rock?
300
is a fossil copy of a organism in a rock
What is the definition of a cast?
300
absolute age dating is more precise that relative age dating
what is the difference between relative age dating and absolute age dating?
300
fossil record contains evidence that five mass extinction events have occurred during the phanerozoic
What does fossil record contain?
300
a volcanic eruption
What is what can effect global climate and food webs?
300
because instead they date the rocks the fossils are embedded inside
Why cant scientists date fossils directly?
400
is a preserved evidence of the activityof a organism
What is the definition of a trace fossil?
400
scientists measure the ratio of unstable isotopes in rocks
What do scientists do in absolute age dating?
400
is the change over time in populations of related orginisms
What is what is biological evolution?
400
no
are all enviormental change sudden?
400
when a fossil forms when a dead organisms over time m is compressed
What is carbonization
500
is a chart that divides earths history into different time units
What is the definition of geologic time scale?
500
igneous rocks come from volcanic magma
Where do igneous rocks come from?
500
it suggests that extinctions have been common through out earths history
What does evidence from the fossil record suggest?
500
if a mountain range or a ocean isolates a species the species might become extinct
if the sea level changes will species become extinct?
500
fossils go through 5 steps of formation mineralization , carbonation , molds and casts , trace fossils , and original material
how do fossils form?