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Earth Science Test
Terms in this set (54)
A fault is
A fracture in the earth where movement has occured
An earthquakes epicenter is
The place on the surface directly above the focus
The San Fransisco earthquake of 1906 occured along what fault?
San Andreas fault
A seismagram shows that P waves travel
Faster than S waves
What is the minimum number of seismic stations that is needed to determine the location of an earthquakes epicenter?
Often generated by movement of the ocean floor
Why do earthquakes often cause damaging fires?
Earthquake vibrations can break gas lines, water lines, and electrical lines
Earths thin and rocky outer layer is its
Most of the information about earths interior was obtained by studying
Through which earth layer are S waves NOT transmitted
The supercontinent in the continental drift hypothesis was called
One kind of evidence that supports Wegeners hypothesis is that
Fossils of the same organism have been found on different continents
What was the main reason Wegeners continental drift hypothesis was rejected?
He could not provide a mechanism for the movement of the continents
According to the theory of plate tectonics
The lithosphere is divided into plates
In the plate tectonic theory, a plate can be made up of
Both continental and oceanic lithosphere
What kind of plate boundary occurs where two plates grind past each other without destroying or producing lithosphere?
Transform fault boundary
A divergent boundary at two oceanic plates can result in a
What kind of boundary occurs where two plates move together, causing one plate to descend into the mantle beneath the other plate?
Which of the following is geographic example of a transform fault boundary?
The San Andreas fault
New ocean crust is formed at
Which of the following results when divergence occurs between two oceanic plates
Typical rates of seafloor spreading are approximately
5 centimeters per year
What forms when one oceanic plate is forced beneath another plate?
A subduction zone
Deep ocean trenches are associated with
The Himalayas in south asia are an example of what type of plate boundary
Convergent continental-continental boundary
Continental volcanic arcs are associated with what type of plate boundary?
Convergent oceanic-continental boundary
Why are subduction zones not commonly found at convergent continental-continental boundaries?
Continental lithosphere is too buoyant to be forced down into the mantle
At a transform fault boundry
Lithosphere is neither destroyed nor produced
Provide strong evidence for seafloor spreading
The hawaiian islands were formed when the pacific plate moved over
A hot spot
How does the age of seafloor sediments change with increasing distance from the ocean ridge?
Highly explosive volcanoes tend to have what type of magma?
Magma with high silica, high viscosity, and higher gas content
What type of volcanoe is built almost entirely from ejected lava fragments?
The broad, sligjtly domed-shaped volcanoes of Hawaii are
A volcano that is fairly symmetrical and has both layers of lava and pyroclastic deposits is a
Composite cone volcano
What plays a major part in determining the form of a volcano?
The most violent volcanic eruptions are associated with what type of volcano?
Magma tends to rise towards earths surface primarily because
Rocks because less dense when they melt
The volcanic landforms at divergent ocean plate boundaries are
Most of the active volcanoes on earth are located in a belt known as the
Ring of fire
In general, what is true about the compostion of the igneous rocks produced in associated with sudbuction zone volcanic activity?
Which type of landform develops at plate boundaries where one oceanic plate descends beneath another?
Volcanic island rift
Folding is usually the result of
The major forces that form folded mountains are
Which of the following mountain ranges was formed by a continental-continental convergent boundary?
Which of the following is an example of a mountain range formed at a divergent boundary?
The mid atlantic ridge
What type of stress is dominant at dovergent plate boundaries?
The geocentric model of the universe stated that
Earth was the center of the universe
The first early astronomer to propose a sun-centered solar system was
The true shape of planetary orbits was discovered by
Which force is most responsible for the formation of a star?
What will be the final stage in the suns life cycle?
Which representa the number 5,400,000,000
5.4 x 10^9
Which represents the number 2.3 x10^7
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