2. Many seismic waves are a lot like ___ ? ___ ___?___ in air.

radio waves
sound waves
water waves
gravity waves

3. If seismic waves are created by an

explosion or pounding they will be reflected but not refracted.
explosion or pounding the will be refracted but not reflected.
earthquake or explosion they will be reflected but not refracted.
earthquake or explosion they will be both reflected and refracted.

4. Geophysicists have found that the Earth is divided into major layers or zones called the

lithosphere, xenosphere, mantle and core.
crust, asthenosphere and core.
crust, mantle and core.
crust, xenosphere, mantle and core.

5. Which one of the following sets of terms is best associated with the Earth's crust?

continental-granitic; oceanic- basaltic
continental-xenolithic; oceanic-basaltic
continental-asthenospheric; oceanic-basaltic
continental-granitic; oceanic- xenolithic

6. Which choice is not a major difference between continental and oceanic crustal materials?

thickness, uniformity and composition
thickness, uniformity and the amount of iron and magnesium in the rock
temperature and hardness
thickness and complexity of composition

7. Choose the least important reason for the study of ophiolites.

They represent a cross section of ocean crust and upper mantle rock.
They represent a portion of ocean floor that has been squeezed up.
They give geologist a good look at what some mantle rock are like.
They give geologist a lot of information about the past since they are the oldest rock on Earth.

8. A major difference between P waves and S waves is

P waves travel faster and can pass through solids, liquids and gases.
S waves travel faster and can pass through solids, liquids and gases.
S waves travel faster and can pass through liquids and gases.
they both travel at variable speeds but only S waves go through solids.

9. The behavior of S waves, as they travel through the Earth, give us evidence for believing that the

Earth has a magnetic field.
outer core is a liquid.
interior of the Earth is quite uniform.
entire core is liquid iron.

10. A gravity meter could give information on all the following except

locating heavy metal deposits under the surface.
determining if the core was a solid or liquid.
locating low density layers of rock under the surface.
locating areas where potential sink holes could occur due to underlying caves

11. According to the telelesson the outer core is

responsible for the Earth's magnetic field and is composed of iron and oxygen or iron and silicon.
a liquid composed of iron and magnesium.
a liquid composed of iron and lead.
a liquid which has convection cells that are responsible for the Earth's internal heat.

12. Aurora or northern lights are created by

solar wind particles interacting with the Earth's gravitational field.
solar wind particles interacting with the Earth's magnetic field.
sun light interacting with atmospheric gases above the poles of the Earth.
sun light interacting with the Earth's magnetic field.

13. The Earth's magnetic field

has increased in strength slightly in the last 150 years.
has both increased at times and then decreased in the last 150 years.
has decreased in strength in the last 150 years.
increased in strength by 5% over the last 200 years.

14. Some rock, like lavas, can become magnetized by the Earth's magnetic field. Studies of old magnetized rock tell us that the

Earth's magnetic field is shrinking very fast.
Earth's magnetic field changes faster in the northern hemisphere than in the southern.
magnetic poles of the past were always near their present location.
Earth's magnetic field can reverse itself by the magnetic poles switching places.

15. The study of ancient magnetism is referred to as

paleomagnetism and reveals that the Earth's magnetic field has been remarkably stable over geologic time.
paleomagnetism and reveals that the Earth's magnetic field has reversed itself many times.
paleomagnetology and reveals that the Earth's magnetic field reversed itself about 250,000 years ago.
paleoreversing and reveals that the Earth's magnetic field reversed itself about 700,000 years ago.

Prepared by: Mike Mitchell

Be sure to review your quizzes before taking the test.