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Terms in this set (10)
The ________________ says that the oldest rocks are on the bottom and the youngest rocks are on top.
Law of Superposition
Lava that hardens on the surface is called a(n) __________________.
A _____________ is a break in the Earth's crust.
The geologic ____________ scale is a record of the life forms and events in Earth's history.
Time in geologic scales are divided into eras and _____________.
When did trilobites first appear on Earth?
An intrusion crosses an extrusion. Which is older?
When did land plants first appear on Earth?
How do geologists determine the geologic time scale?
Both studying rock layers and index fossils
What makes a good index fossil?
widely distributed and existed for a short time.
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