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Trending searches
Which is longer an
era or a period?
What is the longest
time span?
What are divisions
based on?
Rock Layers
Younger rock layers are on top...how do I
know this?
A change in rock layers is called what?
Fossils
What are the 6 types of fossils?
What makes a fossil
a good index fossil?
How do scientists use index fossils?
Mass Extinction
What do scientists think
caused the mass
extinctions?
Explain the idea of
natural selection...
Who developed the idea
of natural selection?
What is the gradual change of a species
over time called?
Evolution
Weathering
Give an example of
mechanical weathering...
Give an example of
chemical weathering...
Geologic Time Scale