Economical petroleum traps are geologically rare.
Answer the following statement true (T) or false (F)
True
Traps that contain economical amounts of petroleum are relatively rare from a geologic perspective.
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Which of the following statements provides the most accurate description of the principle of a lightning rod?
A. It stores the electricity carried by the discharge. B. It intercepts the lightning and safely carries the current around the object it protects. C. It acts to discharge the thunderstorm. D. The positive charge induced in it repels the negative charge in an approaching stepped leader.
Where do most earthquakes occur near midocean ridges?
A) At great depths (more than 100 km) B) Along the axis of the ridge and on transform faults that connect ridge segments C) In the asthenosphere where mantle undergoes decompression melting D) On the boundary between the mantle and the oceanic crust E) All of these are correct.
Fractures in rock that have not involved any fault slippage are called joints.
a. true b. false
Air pressure is only exerted downward
Indicate whether the statement is true or false