Transcript fossil? - Montville.net

fossils
Relative
age of
rocks
Radioactive
dating
Sedimentary
Rocks
evidence
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Question 1 - 10
• are the preserved remains or
traces of living things.
Answer 1 – 10
•fossils
Question 1 - 20
• Fossils provide evidence of
Answer 1 – 20
•how life has changed
over time
Question 1 - 30
• a hollow area in sediment in the
shape of or part of an organism.
Answer 1 – 30
• mold
Question 1 - 40
• evidence of the history of life and
past environments on Earth is
called
Answer 1 – 40
• The fossil record
Question 1 - 50
• When sediments bury an
organism releasing some gases
leaving carbon behind this is
called:
Answer 1 – 50
• Carbon film
Question 2 - 10
• The number of years since the
rock formed
Answer 2 – 10
• absolute age
Question 2 - 20
• In horizontal sedimentary rocks,
the oldest layer is at the bottom
and the newest layer is on the
top and determines the relative
ages of rocks
Answer 2 – 20
• The Law of Superposition
Question 2 - 30
• the surface where new rock
meets up with a much older
rock surface.
Answer 2 – 30
• Unconformity
Question 2 - 40
• What is an index fossil?
Answer 2 – 40
• A fossil that is widely
distributed and represents
a type of organism that
only existed briefly
Question 2 - 50
• Index fossils are useful because-
Answer 2 – 50
• tell the relative ages of
rock layers by how they
occur
Question 3 - 10
• As elements break down over
time they release particles and
energy in a process called
Answer 3 – 10
• radioactive decay
Question 3 - 20
• How fast or slow the radioactive
elements decay is always
constant (never changing) and
the rate of decay is called
Answer 3 – 20
• half-life
Question 3 - 30
• Very useful in dating rocks
because it has a long half-life
Answer 3 – 30
• Potassium-Argon Dating
Question 3 - 40
• When carbon-14 is left in an
organism, scientists measure this
amount that is left to find
absolute age. Is the carbon-14
the radioactive element or the
new element formed?
Answer 3 – 40
• radioactive
Question 3 - 50
•Is Carbon-14 good for
dating rocks? Why/ Why
not?
Answer 3 – 50
• No Carbon-14 is only good for dating plants
and animals that contain carbon and only
dates up to 50,000 years
Question 4 - 10
• What is sediment?
Answer 4 – 10
• Small particles of rock and
remains of living things
Question 4 - 20
• How does sedimentary rock
form?
Answer 4 – 20
• When sediments build up
in layers and harden
Question 4 - 30
• Why is it hard to determine relative age
of sedimentary rock that has a fault in it?
Answer 4 – 30
• Movements along the fault
cause layers to not line up
Question 4 - 40
• What are the steps on how
fossils typically form in
sedimentary rocks?
Answer 4 – 40
• Organism dies
• Organism is buried by sediment
• Sediment hardens and preserves
fossil
Question 4 - 50
• Why is Radioactive dating is
good for igneous rocks but not
sedimentary rocks
Answer 4 – 50
• Scientists can date particles but
not layers in sedimentary rocks.
• Scientists can only date solid
rocks.
Question 5 - 10
• A fossil that shows an organisms
activity, not the actual organism
is called:
Answer 5 – 10
• Trace fossil
Question 5 - 20
• If coal is found in
Antarctica, this shows
evidence of
Answer 5 – 20
• Past climates
Question 5 - 30
• Fossils found in dry plains and plateaus show
Answer 5 – 30
• Evidence of past
environments
Question 5 - 40
• Fossils occurring in a particular order such as
simple organisms coming before more
complex ones is evidence of
Answer 5 – 40
• Change in the fossil record
Question 5 - 50
• Geologists identifying an organism
based on structure of shells and
based on those differences can
identify rock layers which certain
fossils are found is evidence of how…
Answer 5 – 50
• Scientists use index fossils to date rocks