half-lives
How long is the half-life of carbon-14?
5,700 years
What are footprint fossils called?
trace fossils
What period is the Burgess Shale from?
Cambrian Period
rocks contain ________chemicals
radioactive
How many eras were there to study?
four
Five carbon-14 half-lives equals 29,100
false
What parts of an organism/animal are typically fossilized?
the hard parts
What parts of the animals were found that make it so important?
soft parts/ muscles, eyes, guts
chemicals break down into other chemicals
true
Name three periods
Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous, Paleogene, Neogene, Quaternary
What does five carbon-14 half-lives equal?
28,100 years
What are the four steps of fossilization?
sedimentation, deposition, decay, crystalization
How many years ago were the animals in the Burgess Shale alive?
508 million years ago/ mya
How is carbon-14 transferred to animals?
plants/consuming food
What was the earliest bird?
DAILY DOUBLE
archaeopteryx
Every chemical has the same half-life
false
What are bugs often fossilized in?
amber
the burges shale is one of the most ______ fossil sites
important
What chemical does carbon-14 turn into when it decays?
nitrogen
Name the Mesozoic era periods
cretaceous, jurassic, triassic
What chemical is useful for finding the age of the Earth?
uranium/ uranium-lead dating
What is the group of rocks/fossils in the Rocky Mountains called?
Burgess shale
Name one animal found in the Burgess Shale
anomalocaris, opabinia, wiwaxia
How do plants take in carbon dioxide?
photosynthesis
What % of organisms that have lived are extinct?
99%