The O horizon is ________
A) composed primarily of bedrock
B) composed of equal amounts of bedrock and organic material
C) primarily composed of organic materials
D) usually more sand than silt or clay
E) primarily loam
Answer: C
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What will be an ideal response?
Which of the following environmental lapse rates represent stable inversion conditions?
A) A
B) B
C) C
D) D
The main way new oceanic crust is created is by
A) eruption of lavas and solidification of magmas at depth. B) sediment scraped off a subducting slab. C) continents that subside below sea level. D) continental rifting, before the continents separate. E) magmas along an ocean-continent convergent boundary.
What is the approximate lifetime of an ATP molecule in a cell?
A) 1 second B) 1 minute C) 1 hour D) 1 day