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Earth Review 1

name: ______________________________
Across
Comparing or matching layers of rock or fossils from one area with another area.
The actual age of something.
Divisions of geologic time less than a period and greater than an age.
Specific groups of animals have succeeded one another in a definite sequence through Earth's history.
The age of something in relation to other things, not an absolute date.
Units of geologic time equal to one billion years.
Layers of sedimentary rock are initially deposited horizontally.
The most recent era on the geologic time scale.
Divisions of geologic time that are longer than an epoch and included in an era.
Geologists who study Earth's past.
In sedimentary rock layers, the layers near the bottom are the oldest and the layers near the top are the youngest.
The preserved remains or traces of organisms that lived in the geologic past.
Down
Annual layers of sediment.
A timeline that describes the timing and relationships of events in Earth's history
Measuring regular, sometimes cyclical, events.
Atoms of the same element that are different from each other.
The same geological processes which operate today have been operating all along.
The study of rocks, fossil organisms, and related remains in geologic history.
If a rock contains fragments of another rock, the fragments must be older than the rock containing them.
Fossils that form from marks that living organisms leave.
The second most recent era on the geologic time scale, spanning from 245 m.y.a. to 65 m.y.a; often called the "Age of Dinosaurs."