Geologic Time Crossword

What states the physical, chemical, and biological laws that operate today and have also operated in the geologic past?
What means identifying rock units that were formed first, second, and third and so on?
States that in an undeformed sequence of sedimentary rocks, each bed is older than the one above it and younger than the one below it.
Layers of sediment are generally deposited in a horizontal position.
We can assume that the fault or intrusion is younger than the rocks affected.
A long period during which deposition stopped, erosion removed previously formed rocks, and then deposition resumed.
During the pause in deposition, a period of deformation and erosion occurred.
Rocks of similar age in different regions matched up.
Remains or traces of prehistoric life.
Teeth, bones, and shells.
'' Turned in to stone ''
Condition for preservation
Are widespread geographically
When nuclei are unstable, they break apart.
Expressing the rate of radioactive decay.
A way to calculate the ages of rocks and minerals that contain certain radioactive isotopes.
To date recent events.
Earth's 4.56 billion year history