Plate Tectonics

By Mildred

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Jeopardy

What kind of boundary exists between the Pacific and

Indian-Australian plates?

A convergent boundary

What kind of geological feature is usually located where two

oceanic plates converge?

A trench

The Hawaiian Islands chain was formed as the pacific plate moved

over a.....

Hot Spot

Along which kind of boundary is new sea floor being added?

A divergent boundary

A transform boundary

What kind of boundary exists along the California coast?

At what depth in the earth is the interface between the

asthenosphere and the stiffer mantle?

About 600-700 km

What is the probable composition of the inner core?

Iron and nickel

What is the pressure at a depth of 3600 km in the earth?

2 million atmospheres

DAILY DAILY DOUBLEDOUBLE

About how thick is the earth's outer core?

About 2200 km

What is the melting point of the rock at a depth of 1000 km?

4000 - 4100 degrees C

How long will it take P waves to travel to a seismic station

that is 4000 km from the epicenter?

7 minutes

It takes S waves 13 minutes to travel from an epicenter to a

seismic station. How long will it take P waves to reach the

same station?

7 minutes 20 seconds

A seismic station is 7000 km from an epicenter. How long after P waves arrive will S

waves arrive?

8 minutes 40 seconds

P waves arrive at a seismic station at 1:22:00. S waves from the same earthquake

arrive at 1:26:20. What is the distance from the epicenter to

the seismic station?

2800 km

The difference in arrival times between P and S waves is 9

minutes. If the P waves arrived at 4:56:00, what time did the

quake occur?

4:46:00

What term describes the process by which one plate

dives beneath another?

Subduction

What kind of rock makes up most of the contenents?

Granite

As distance from a mid-ocean ridge increases, the age of the

sea floor

Increases

What force causes the plates to drift?

Convection currents in the mantle.

Where are earthquakes and volcanoes most likely to be

found?

Along plate boundaries

What kind of rock makes up most of the sea floor?

Basalt

The study of the magnetic properties of ancient rocks is

called

Paleomagnetism

Why might a seismic station receive P waves but no S waves from a particular

earthquake?

The S waves could not pass through the liquid outer

core.

What geographic feature is likely to be found in regions where two continental plates

collide?

A mountain range

What term describes a region on the earth's surface that

receives neither P nor S waves from a particular earthquake?

A shadow zone