Time Time Time
The Largest division of geologic time.
Eon
A species where 2 or more species are descended from.
Common Ancestor
Sedimentary Rock
The process by which an organism has parts of it preserved or imprinted in rock.
Fossilization
Both the inside and outside of an organism.
Anatomy
All known fossils in Earth's history arranged in chronological order.
Fossil Record
A graph that indicates how closely related organisms are to each other.
Cladogram
Layers of Rock, which are usually visible.
Strata
The study of fossilized organisms.
Paleontology
What is the only group of dinosaurs living today?
Birds
The second longest division of geologic time.
Era
The gradual change of living things over many generations, due to changes in inherited traits.
Evolution
A piece of earth's crust that sits on and moves over the mantle.
Tectonic Plates
An organism preserved in rock that is common of a particular time or environment and used to identify geological time periods.
Index Fossil
The man dubbed "the Father of Evolution". His most well-known voyage was to the Galapagos islands.
Charles Darwin
The 4th longest division of geologic time.
Epoch
A developing animal that hasn't been hatched or born yet.
Embryo
A natural process that forms and shapes the surface of the earth.
Geoscience Process
A scientist who studies the fossils of extinct organisms.
Paleontologist
The chemical deoxyribonucleic acid that contains genetic information of organisms.
DNA
The 3rd longest division of geologic time.
Period
A similar body part that appears across different species due to a common ancestor.
Homologous Structures
The geologic principle where the oldest layers of earth are at the bottom and the youngest is at the top.
Law of Superposition
The process by which the age of a fossil or rock is determined through measuring the decay of radioactive isotopes.
Radiometric Dating
A unit of DNA that is located on a chromosome and determines an organisms traits.
Gene