Show:
ROCKS AND STUFF
FOSSILS
Parts of a Volcano
Eruptions
California Geology
100
What type of rocks contain fossils?
Sedimentary rocks
100
What type of fossils help scientists tell the relative age of the rock layer in which it is found.
Index Fossils
100
Beneath a volcano, the magma collects in a pocket called a...
Magma chamber
100
The material which determines how explosive a volcanic eruption will be is...
Silica
100
How did the San Andreas fault form.
As plates slide past each other, they push and pull on the crust with an enormous force. This makes the crust break which forming faults.
200
What type of rocks are formed from the remains of other rocks?
All Rocks (remember it's a rock CYCLE)
200
The oldest fossils of living things that appear in the geologic record are how old?
3.5 Billion years old
200
Magma travels from the magma chamber through a long tube called a...
pipe
200
Geologists classify volcanic eruptions into 2 groups. The groups are...
quiet and explosive
200
( True/False) All of the volcanoes on the west coast of North America form from colliding boundaries...
True
300
Radioactive dating allows scientists to determine the _______ age of a rock.
Absolute
300
__________ is the study of the structure of planet earth and the forces that make and shape the earth.
Geology
300
Molten rock and gas leave through an opening at the top or side of the volcano which is called a...
Vent
300
What terms do geologists use to determine a volcano's stage in its life cycle?
Active,dormant,and extinct
300
How did the Sierra Nevada form?
The force of the plate motions pushed a batholith up, forming the mountains we know today.
400
A(n) ____________ shows where some rock layers were lost to erosion.
Unconformity
400
The earliest forms of life found in the fossil record are similar to today's __________.
Bacteria
400
What is a lava flow?
A lava flow is the area covered by lava as it flows out of the vent.
400
A pyroclastic flow is an explosive volcanic eruption that hurls out a mixture of...
hot gases,ash,cinders,and bombs
400
What is a basin?
A basin is a broad bowl-shaped valley.
500
An unconformity is a _________ in the geologic record
Gap
500
The ________ _________ of a rock or fossil is it's age as compared to another rock or fossil.
relative age
500
A bowl-shaped area that may form at the vent of a volcano is a...
crater
500
What is a geyser?
A geyser is a fountain of water and steam that erupts from the ground.
500
How did Central Valley form?
The Sierra Nevada and Coast Ranges are on both sides of the valley creating the central valley between.