2.
Numeric age of a layer of rocks or fossils
3.
Unit of geological time when a rock series is deposited.
5.
Process when geological or physical characteristics change over time.
6.
Remains of a prehistoric animal.
7.
Record of rock layers over a period of time.
8.
The time it takes for half of the radioactive nuclei now present to decay.
9.
Remains of plants and animals that had lived for a limited amount of time.
10.
Cutting Relationships states that the geologic feature which cuts another is the younger of the two features.
11.
scientists use this to determine the relative ages of rock strata, or layers.
12.
A loss of a significant portion of a living species.
13.
Branch of science where you work with fossil animals and plants.
14.
A specific area in time.
15.
Earliest era in earths history.
16.
Calculating age in years in geologic materials by measuring the presence of a short life radioactive element.
17.
The age of a rock layer compared to other layers.
18.
A fossil of a trail, burrow, footprint, or another trace of an animal thats not there.
19.
A break in the continuous rock record.
20.
The idea that Earth has always changed in uniform ways.
21.
Living organism that shapes its environment.
22.
Non-living part of an ecosystem that shapes its environment.
23.
A place for storage of fluids.
24.
Measure of the number of electric or magnetic field lines passing through a surface in an amount of time.
25.
When plants or other organisms turn light into chemical energy.
26.
When plants or other organisms turn chemicals into carbohydrates.
