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What did marine fossils discover on a Canadian mountaintop tell scientists?
slanting of rock layers
how life has changed
climate change
The rocks on the mountaintop were once below the ocean's surface
to divide Earth's history into managable parts
Paleozoic
ideal
the rate of decay for radioactive element in the rock
What do scientists think may have caused dinosaurs to become extinct?
slanting of rock layers
how life has changed
climate change
The rocks on the mountaintop were once below the ocean's surface
to divide Earth's history into managable parts
Paleozoic
ideal
the rate of decay for radioactive element in the rock
How do geologists use the geologic time scale?
slanting of rock layers
how life has changed
climate change
The rocks on the mountaintop were once below the ocean's surface
to divide Earth's history into managable parts
Paleozoic
ideal
the rate of decay for radioactive element in the rock
Which word best describes the geologic column?
slanting of rock layers
how life has changed
climate change
The rocks on the mountaintop were once below the ocean's surface
to divide Earth's history into managable parts
Paleozoic
ideal
the rate of decay for radioactive element in the rock
Which era ended with the largest mass extinction in Earth's history?
slanting of rock layers
how life has changed
climate change
The rocks on the mountaintop were once below the ocean's surface
to divide Earth's history into managable parts
Paleozoic
ideal
the rate of decay for radioactive element in the rock
What is tilting?
slanting of rock layers
how life has changed
climate change
The rocks on the mountaintop were once below the ocean's surface
to divide Earth's history into managable parts
Paleozoic
ideal
the rate of decay for radioactive element in the rock
What can scientist learn from studying the relationships between fossils?
slanting of rock layers
how life has changed
climate change
The rocks on the mountaintop were once below the ocean's surface
to divide Earth's history into managable parts
Paleozoic
ideal
the rate of decay for radioactive element in the rock
What does a scientist need to know to figure out the absolute age of a rock?
slanting of rock layers
how life has changed
climate change
The rocks on the mountaintop were once below the ocean's surface
to divide Earth's history into managable parts
Paleozoic
ideal
the rate of decay for radioactive element in the rock
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