Definitions
The study of earthquakes
Seismology
______________ are the fastest type of earthquake waves
P (or primary)
Inactive but can erupt again
Dormant
An instrument used to record the vibrations caused by an earthquake
Seismograph
The inner core of the earth is thought to be solid, liquid, gas, or plasma?
Solid
The study of volcanoes
Volcanology
Smaller earthquakes, called __________________, often follow a larger earthquake at frequent intervals
Aftershocks
Probably will not erupt again
Extinct
Earthquakes caused by sudden movements of rock beneath the earth's surface
Tectonic earthquake
The earth's outer layer of solid rock
Crust
The study of earth
Geology
The general name for a mass of underground volcanic rock is a ________________.
Igneous intrusion
Consists primarily of erupted volcanic ash and rock fragments held loosely together
Cinder-cone
The point at which an earthquake begins
Hypocenter
The most abundant element in the earth's crust
Oxygen
The central portion of the earth
Core
The ________________ is the "plastic" rock on which the tectonic plates float.
Asthenosphere
Formed partly by explosive eruptions of ash and rock fragments and partly by mild lava flows
Composite
80% of all the world's earthquakes occur in which belt?
Circum-pacific belt
The area between the upper mantle and the lower mantle
Transition zone
Epicenter
The bottom of the mantle is called the ___________________.
Core-mantle boundary (or the Gutenberg discontinuity)
The idea that rapid movement of tectonic plates during the Flood are responsible for most of Earth's features
Catastrophic plate tectonics
85% of all earthquakes are this type of earthquake
Shallow-focus
The boundary line between the crust and the mantle
Mohorovicic discontinuity (or Moho)