What is the cause of a magnetic field about a permanent magnet, and about a current-carrying wire?
What will be an ideal response?
All magnetic fields have their origin in moving electric charges. About a permanent magnet the moving charges are the electrons in the atoms making up the magnet—most commonly iron atoms. About a current-carrying wire, the moving electrons produce the magnetic field.
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In a conditionally unstable atmosphere: a. both saturated and unsaturated air parcels are unstable
b. saturated air parcels are stable and unsaturated parcels are unstable. c. saturated air parcels are unstable and unsaturated parcels are stable. d. None of these choices.
When using rocks to study Earth's history, information about the surface environment is best provided by which of the following types of rock?
A. schist and slate B. dunite and rhyolite C. limestone and shale D. quartzite and marble E. granite and basalt
Rivers downcutting into a land surface, in the absence of other forces, usually tend to erode a ________-shaped form when viewed in cross-section across its valley
A) groove B) V C) U D) flat bottomed E) delta
In order for continental drift to occur, the continental lithosphere must behave plastically.
Answer the following statement true (T) or false (F)