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Science definitons

Across
The geologic age of a fossil organism, rock, or geologic feature or event
the theory that all matter is made up of tiny indivisible particles
method of determining the age of earth materials
behavior of an electron in an atom
Positive part
used as a benchmark to measure how the other tested subjects do.
Neutral part
Down
a basic law of geochronology, stating that in any undisturbed sequence of rocks deposited in layers
Tells you all the elements
true age of a rock or fossil
Basic Part of matter
Negative part
Brain of an atom
the name given to a horizontal row of the periodic table