Geological Time
What is the longest measure of geologic time?
An Eon
Radiation is measured with what device?
Geiger Counter
Younger
An animal that is able to live on both land and in water.
An amphibian
What geologic period are we currently living?
Quaternary Period
Geologic dating can be divided into two GENERAL categories. What are they?
Absolute (numeric) and relative
Pine trees
This land form contained of the continents grouped together.
Pangea
How long do geologic eras tend to be?
10's of millions to 100's of millions of years
What is the measure of the amount of time it takes for half of the unstable nuclei of a sample to decay?
A group of fossils which have been arranged in chronologic order.
Fossil record
The number after an isotope's name stands for what? (Hydrogen-2)
The number of protons and neutrons
The Cambrian Explosion
If an element decays and releases a neutron, it has formed a new _________________ of the same element.
Isotope
Placental mammal
The amount of radiation a substance releases determines its:
Radioactivity
What type of even is usually responsible for the end of geologic period?
An extinction
The product of radioactive decay is called what? (The new material that is produced through the decay.)
The daughter
An event in which 75% or more species go extinct within a short amount of time.
Mass extinction
This geologic era is characterized by dinosaurs and the first appearance of flowering plants.
Mesozoic era