The basic sequence within a lightning flash includes all but which of the following?
A. Discharge begins within the cloud and initiates a dimly visible, negatively charged stream of electrons propagating downward.
B. The connection initiates the return stroke, sending positive charges up to the cloud with a brilliant flash; more lightning strokes occur as charges flow between the cloud and the ground.
C. The conductive stream moves earthward in 50-meter jumps as a stepped leader; as the stepped leader nears the ground, the electric field at the surface increases greatly, shooting streamers of positive sparks upward and connecting with the stepped leader about 50 meters above ground.
D. Static electricity builds up within the lower thundercloud and induces identical-polarity charges on the ground.
Answer: D
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A) there is a 40% chance that it will not rain within the forecast area B) there is a 40% chance that any random place in the forecast area will receive measurable rainfall C) it will rain on 40% of the forecast area D) it will rain 40% of the time over the forecast area
Thunder is a very destructive force
Indicate whether the statement is true or false
The principle of ________ states that organisms succeed one another in a definite, determinable order that can be used to recognize a specific time period
A) correlation B) superposition C) fossil succession D) lateral continuity
Which of the following is the best example of heat transfer by conduction?
A. Water flows in a circular path in a pan. B. Seawater is drawn into a mid-ocean ridge. C. A burner gives heat through the air without touching the object. D. Newly created lithosphere loses heat to adjacent rocks.