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What is Precambrian?
Earliest time in Earth's history
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Igneous rock that cut through sedimentary layer is always…………….
Younger than the layers of sediment it cuts through
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Dinosaur footprint is an example of…………………….
A trace fossil
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How do scientist know what dinosaurs looked like?
They examine fossils for clues
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How did earth change over time?
Earth is constantly changing
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What is the smallest unit of geologic time?
An epoch
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What cause the soft parts of an organism to decay very quickly?
Preserve only traces of the hard parts of an organism
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Why don’t igneous rocks contain fossil?
The high temperature of molten rocks from which igneous rocks forms destroying any trace of plants and animals
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Where might a mammoth that has complete bones, muscle, skin, and hair be preserved in?
Ice
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Where is the oldest layer of undisturbed sedimentary found?
On the bottom
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The first evidence of life can be traced back to what year?
3.8 billion years ago
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Where can you find preserved remains of a small insect?
Amber
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What are fossils ?
TRACES OF REMAINS OF LIVING THINGS
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When is the Precambrian time?
First 4 billions years
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What can scientist determine by studying layers of sedimentary rock?
Relative Age of the layers
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What does the uniformitarianism theory states?
Earth is constantly changing
400
What are the earliest fossils
one-celled organisms
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What is Hutton theory called?
Uniformitarianism
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What are two types of rock fossils?
Cast fossils and Mold Fossils
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How is the rate of the breakdown of radioactive material measured?
Half-lives
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What does the rings in a tree cross section indicates?
How much the tree grown in various years
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What does rock fossils form in?
Frequently in sedimentary rock
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When did humans first appeared?
during the age of mammals
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How does scientist learn about changes that occurred in Earth’s atmosphere?
Ice Cores
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