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100
The inner core of the Earth is thought to be this.
What is a solid?
100
Eighty-five percent of all earthquakes are this.
What are shallow-focus ?
100
mantle
What is the middle of the earth's three main layers called?
100
This is name of all the present-day continents thought to have been one land mass.
What is Pangaea?
100
An archlike structure formed when rocks are folded upward.
What is an anticline?
200
most abundant element in the earth's crust
What is oxygen ?
200
Large almond or teardrop shaped pieces of ejecta that form when lava solidifies.
What is a volcanic bomb?
200
dormant
What is an inactive volcano that can erupt again called?
200
geology
What is the study of the earth?
200
The point on the earth's surface directly above the point where an earthquake begins.
What is the epicenter?
300
focus
What is the point deep in the earth at which an earthquake begins?
300
A bowl-shaped hollow more than 2 miles wide that is formed by the collapse of an underground magma chamber.
What is a caldera?
300
A domelike igneous intrusion formed when magma bulges overlying rocks upward is this.
What is a laccolith?
300
tectonic earthquake
What is an earthquake caused by sudden movements of rock beneath the earth's surface?
300
A broad, gently sloping volcano made of large quantities of highly fluid lava that hardened into rock.
What is a shield volcano?
400
This is produced from the bending or buckling of rocks under great pressure.
What is a fold ?
400
About 80% of the world's earthquakes occur here.
What is the circum-Pacific belt?
400
An instrument that is used to record the vibrations caused by an earthquake is this.
What is a seismograph?
400
Atype of volcano consisting primarily of erupted volcanic ash and rock fragments held loosely together.
What is a cinder-cone volcano?
400
The channel in a volcano through which gases, ash, and molten rock are ejected from the earth's interior is this.
What is the vent?
500
The type of fault where rocks along one side of the fault move horizontally along the fault.
What is a strike-slip fault?
500
The narrow zone of active volcanoes that nearly encircles the Pacific basin is this.
What is the Ring of Fire?
500
seismology
What is the study of earthquakes?
500
This is a large, well-know strike-slip fault in western California.
What is the San Andreas Fault?
500
A volcano formed partly by explosive eruptions of ash and rock fragments and partly by mild lava flows.
What is a composite volcano?
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