Cards in this guide (13)
At divergent plate boundaries in the ocean magma rises and melts because of what
Because of a decrease in pressure.
What process occurs when an earthquake's shaking turns loose soil into mud
the answer is liquefaction
How much of an increase in wave amplitude is seen from an earthquake measuring 5.4 on the Richter scale compared to one measuring 4.4
Why did most scientist reject Wegener hypothesis of continental drift
Because Wegener could identify the cause of continental
drift
Which is not a factor in calculating the moment magnitude of an earthquake
magnitude of past earthquakes in the area
What is the difference of the P waves and S waves used to locate an earthquake's epicenter
P waves, also called primary waves, are the first waves to be
registered on a seismograph. The S waves, or secondary waves, are
the second and slower wave to register on the seismograph. When
locating an earthquakes epicenter seismologists take the first
reading of the P wave, and then take the reading from the S wave.
At the station of where the earthquake was recorded, seismologists
draw a large circle from where the earthquakes epicenter could be.
TO exactly located the earthquakes epicenter there needs to be at
least 3 dfferent staions where the earthquake hit to determine its
epicenter using the S and P time interval.
Why was Alfred wegeners idea that tidal forces might cause continental drift refuted as impossible
It would stop earth's rotation.
Showed that the tidal forces needed to move continents would
stop earths rotation.
When p wave bend while traveling through earth's core what happen when arrive at the shadow zone
serveral minutes later than expected
When new rock is added to an oceanic ridge the magnetized strips on either side of the ridge are evidence of sea-floor spreading. This is because the rocks on the two sides of the ridge
are equal in width and polarity
Do glaciers cover 70 percent of earths land
No. Only a fairly small percentage of Earth's land is covered by
glaciers. However, about 75% of the surface is covered by
water.
What was the reason wegeners continental drift hypothesis was rejected
His evidence was incorrect.
The trace that records an earthquake from seismic instruments is called a
How do ancient glacial deposits in Africa India Australia and South America support the idea of continental drift