Part II Flashcards
What does the Richter Scale measure?
magnitude of an earthquake
What is an earthquake?
moving in Earth’s crust because of the vibrations within Earth, caused by certain movements of rock.
What is an instrument used to study earthquakes?
seismograph
In what order do earthquake waves arrive at the seismic stations?
P-Waves
S-Waves
Surface Waves
What is a Tsunami?
A large wave caused by an underwater earthquake
A major earthquake with lots of destruction would be a _________ on the Richter Scale.
8 or 9
Earthquakes, volcanoes and other natural disasters occur because of the movement of the oceanic and continental plates.What causes these plates to move?
Convection currents in the mantle.
What is the volcanic crater?
ball shaped area that may form at top of volcano, near central vent
What is the magma chamber?
where magma (liquid rock) is held under the Earth’s crust.
Where are the volcanoes primarily created or found?
Subduction Zones
Molten rock found ON the surface of Earth is known as __________.
lava
What magma?
melted but still semi-solid rock in the mantle
Define pyroclastic flow?
The flow of ash, cinders, “bombs” and gases down side of a volcano during eruption.
What is a hot spot? Give examples of volcanoes found in hot spots.
Area where magma from deep within the mantle welts through the crust above it.
What do we call a volcano that has not erupted in a long time but that scientists believe may erupt sometime in the future?
Dormant
