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Plate Tectonics

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Gudrun Cremin

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Cards in this guide (12)
What is the Ring of Fire

The Ring of Fire (Pacific Ring of Fire) is an area of Pacific Plate subduction, rimming (of course) the Pacific Ocean. The plate subduction creates a line of volcanism geographically around its perimeter that appears to form a circle or ring.

The Ring of Fire is the subducting plate boundary of the shrinking Pacific Ocean. The subducting oceanic crust is being drawn under less dense oceanic and continental crust and is melting into the upper mantle which can lead to volcanism and earthquakes.

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

Ten times

Use the words sea floor spreading and mid ocean ridges in a complete sentence

Mid ocean ridges are the direct result of sea floor spreading.

After the Cambrian explosion what form of life evolved

Single celled organisms.

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. 

At what kind of boundary does oceanic lithosphere plunge beneath and overriding continental plate

Convergent oceanic-continental boundary

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 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

Which describes the correct order of the geologic time scale from oldest to most recent

A.

Precambrian Time - Paleozoic Era - Mesozoic Era - Cenozoic Era

B.

Cenozoic Era - Paleozoic Era - Mesozoic Era - Precambrian Time

C.

Mesozoic Era - Paleozoic Era - Precambrian Time - Cenozoic Era

D.

Paleozoic Era - Precambrian Time - Mesozoic Era - Cenozoic Era

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

magnitude

How do ancient glacial deposits in Africa India Australia and South America support the idea of continental drift

G

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