Geologic Time Scale
Plate Tectonics
Volcanoes
Fossils
Rocks
100
This unit of time is named after the location in which the rock was first studied.
What is period?
100
Alfred Wegener is best known for this hypothesis.
What is plate tectonics?
100
These are the three factors that affect how magma form.
What is temperature, amount of gas in the lava and viscosity?
100
Dinosaurs became extinct about this many million years ago.
What is 66 millions years ago?
100
This ype of rock forms under heat and pressure.
What is metamorphic?
200
This is what an animal with no back bone is called.
What is invertebrate?
200
This is the original name of the super-continent when all of the continents were originally connected.
What is pangaea?
200
The most explosive type of volcanic activity is associated with these.
What are composite cones?
200
In a rock record, these show as an angular unconformity.
What are faults?
200
A rock that forms on the outside of a volcano is called this.
What is an extrusive igneous rock?
300
This is when an organism with the traits that are suited for a specific environment have a better chance for survival.
What is natural selection?
300
Complex mountain systems such as the Himalaya Mountains are a result of this.
What is continental-continental convergence?
300
A magmas viscosity is directly related to this.
What is its silica content?
300
Determining the age of a rock layer in relation to other rock layers is called this kind of dating.
What is relative dating?
300
These are metamorphic rocks that are lacking in stripes or bands.
What are non-foliated rocks?
400
When an organism is no longer on Earth it is considered this.
What is extinct?
400
This is the type of plate boundary where two plates collide.
What is convergent boundary?
400
These types of volcanoes are associated with Yellowstone National Park and the Hawaiian Islands.
What are shield volcanoes?
400
This is the only proof that scientists have for a volcano or meteorite ending the period of the dinosaurs.
What is a thick layer of iridium rock?
400
These sedimentary rocks formed from once living things.
What are organic rocks?
500
This is the earliest life form on Earth.
What is bacteria?
500
Most of Earth's earthquakes, volcanoes and mountain building occur here.
What is at plate boundaries?
500
This is what the very large depression at the top of some volcanoes are called.
What is caldera?
500
These three conditions help to preserve fossils.
What are a quick burial, having hard parts like bones and teeth, and protection from scavengers.
500
This type of rock has layers called foliations.
What is metamorphic rock?
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