a fossil that lived for a short time in many places around the world
What is an index fossil?
200
the movement and placement of rock particles
What is transportation?
200
it wears away/ breaks apart rocks and landforms
What is erosion
300
an existing rock changes due to extreme heat and/or pressure
how does a metamorhpic rock form?
300
4.5 billion years old
What is the age of the earth?
300
they show important information about rock layers that contain the same fossil in them
why are index fossil important to geologists?
300
two tectonic plates hit push into eachother and one plate is pushed on top of the other and it rises up and forms a mountain
What is mountain building?
300
when the soft rock wears away leaving knobs and cliffs of harder rock
What is differntial erosion?
400
rock particles settle and get compactd and cemented together
How does a sedimentary rock form?
400
about 10,000 million years old
What is the ae of the grand Canyon?
400
they show important imformation about prehistoric enviromets
Why are fossils important to geologists?
400
when rock particles settle and deposit
What is deposition?
400
when water freezes inside the crack of a rock and it breaks the rock in half
What is ice wedging?
500
the way they form
What is the major difference between the rock types?
500
the conection between two or more different rock formations
What is correlation
500
the trilobite
What is a better example of a index fossil, a trilobite that lived for a few million years in many places around the world or a fern that lived for 5 million years in the same place?
500
mountain building, new crust formation, and sedimentation
What are contructive processes?
500
weathering by gravity, wind, water, erosion, and tectonic activities.