Science Vocabulary Crossword

The remains,imprints, or traces of prehistoric organisms
A fossil formed when an organism dies and is covered by sediment, its flesh decays and bones deteriorate due to chemical reactions, and a cavity remains below the ground surface
Something is it's age in comparison to the ages of other things
The remains of species that existed on Earth for relatively short periods of time
A type of body fossil that forms when crystals fill a mold
Fossils in which the spaces inside are filled with mineralsfrom groundwater
Gap in the rock layer that is due to erosion or periods without any deposition
The age, in years, of a rock or other object
Thin film of carbon residue preserved as a fossil
An isotope is the time it takes for half of the atoms in the isotope to decay
A undisturbed layers of rock, the oldest rock is on the bottom and the rocks become progressively younger towords the top
process in which some isotopes break down into other isotopes and particles
process used to calculate the absolute age of rock by measuring the ratio of parent isotope to daughter product in a mineral and knowing the half-life of the parent
principle stating that Earth processes occurring today are similar to those that occurred in the past
a scientist who studies fossils
Rock formed when sediments are cemented and compacted
No more of
preserved to become a fossil
maintain in its original or existing state
the basic unit of a chemical element