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geo directory

Some of these questions must be answered by consulting your textbook which correlates with the video series.  Consult: "Physical Geology -Earth Revealed" by Carlson, Plummer and McGeary; published by McGraw Hill, New York City, NY


3. Earth's Interior 
Oil wells do more than just produce oil — they serve as windows to Earth’s interior. This program introduces the topic of geophysics, exploring methods of studying what lies beneath Earth’s surface. Geophysicists use seismic wave studies, variations in temperature, magnetic fields, gravity, and computer simulations to create models of deep structures.

Episode 3:   Earth's Interior

Video:  How deep have we drilled into the earth, relative to it's size?

What processes allow us to plot the main zones of earth's interior? p. 29

Video:  Describe the internal structure of the earth.

Video:  List  the two fundamentally different types of crustal rock.

What are the differences in thicknesses and composition between oceanic and continental crust? p. 29 - 30

What is the boundary separating the crust from the mantle known as? p. 30

The lithosphere is believed to float or slide on a "plastic or slushy" low velocity layer known as what? p. 31
Video:  What are the two types of seismic waves that are used to study the structure of the Earth?

  Which kind of wave disappears when they reach the Earth's core.  Why? p. 33

Video:  Which kind of wave is also called a shear wave and travels quite slow?

Video:  Which kind of wave is also called a primary wave and travels fastest?

'Rebound', 'Isostacy' or 'Isostatic adjustment'  has many implications for our landscape.  Explain. p.36 - 37

Video:  Why are ophiolites and xenoliths of special interest to geologists?

Video:  How does paleomagnetism provide evidence for magnetic field reversals?

Video:  On an average, how often does earth's magnetic field reverse?

What is the cause of the earth's magnetic field according to the prevailing theory? p. 40

Are we overdue for a magnetic reversal?  If it happened what would be the possible effects? p. 42

Like a gravity meter, a magnetometer can be used to learn about what lies below the surface of
the Earth.  How does this work?  p. 45

What is the average geothermal gradient within the earth's crust? p. 45

A region that has  "high heat flow" measured by sensitive thermal devices  indicates that what kind of features might be below the surface? p. 47

link to answers for worksheet 3