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What is a mass extintion?
It happens when many species go extinct at the same time
When many species go extinct at the same time
Mass extinction
The clay layer formed from a meteorite impact at the end of the Mesozoic era
K-T boundary
What is the K-T boundary?
The clay layer formed from a meteorite impact at the end of the Mesozoic era
What is one famous example of a key bed?
A thin layer of clay that is called the K-T boundary
What do scientists use to identify key beds?
They use index fossils or characteristics unique to rock layers to identify the key bed
It is a layer of rock that scientists can clearly identify
Key bed
What is a key bed?
It is a layer of rock that scientists can clearly identify.
Layers of rock that have the same index fossils are not the same age. Is this true or false?
False
They are mineralized remains or evidence of plants and animals that lived long ago
Fossils
What is a sediment?
They are the particles from death organisms, along with pieces of rock
Fossils found in the same rock layers
Index fossils
What are index fossils?
Fossils found in the same rock layers
Pollens cannot form fossils.          Is this true or false?
False
The types of organisms that are fossilized in a layer give clues about what the land was like.      Is this true or false?
True
Fossils can tell scientists about environments on Earth a long time ago.                                                  Is this true or false?
True
Fossils appear in rock strata in a certain order. This record tells how organisms have changed over time
Geologic time scale
What is a geologic time scale?
Fossils appear in rock strata in a certain order. This record tells how organisms have changed over time
What is this?
Geologic time scale
They are the particles from death organisms, along with pieces of rock
Sediment
How are body fossils formed?
They form when the body of a dead plant or animal is covered in sediments.
What is a fossil?
They are mineralized remains or evidence of plants and animals that lived long ago
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