Dating Methods
Species that lived for a relatively short time but whose fossils can be found in many locations are known as what?
Index Fossils
How old is the Earth?
4.6 billion years old
What organisms were dominant during the "Era of Reptiles" known as the Mesozoic ERA?
Dinosaurs
The epochs, periods, eras, and eons are an examples of (?) intervals. They are a way to measures the long history of the Earth in what way, they are amounts of what?
Time Intervals
What is the era we live in?
Cenozoic
In undisturbed layers of rock, the bottom layers will be older than the top layers
The Law of Superposition
The naturally preserved remains, impression, or trace of a once-living organism from a past geological age.
Fossil
What type of animal became abundant after the extinction of dinosaurs?
mammals
Age of the Reptiles. The first small dinosaurs appear.
Triassic
From largest to smallest, this is the correct order of the main divisions of the geologic time scale.
Eon, Era, Period, and Epoch
A method of estimating age by examining the order of geological events in rock based on their relationships to one another across different layers. An example of this is the Law of Superposition.
Relative Dating Method.
Layers of visually distinguishable rock or soil.
Strata
When melted rock cuts through older rock layers and then cools, it forms this type of feature, which is younger than the layers it cuts across.
Intrusion
An event in which many types of living things become extinct at the same time. They divide the Geologic Eras.
Mass Extinction
What are the shortest of the 4 ways time is measured on a geologic time scale?
Epochs
Using radioactive dating, scientists can determine the age of rocks by studying radioactive isotopes within them. Which dating method is being used?
Absolute Dating Method
The name of Earth's Supercontinent.
Pangaea
Someone who studies Rocks?
Geologist
When did single-celled organisms appear?
Precambrian
What is the longest of the 4 ways time is measured on a geologic time scale?
Eons
Who proposed the hypothesis of Continental Drift?
Alfred Wegener
The scientific theory that Earth's outer shell is divided into large, rigid pieces of rock that move slowly over the planet's interior.
Plate Tectonics
Radiocarbon dating measures the _____________ of carbon left in an organism.
Half-life
Which Eon are we currently living in?
Phanerozoic
Which Eon is the moon, sun, and Earth still forming?
Hadean