Important marine autotrophs that have silica incorporated into their cell walls are ________
A) coccolithophorids
B) cyanobacteria
C) diatoms
D) dinoflagellates
E) radiolarians
C
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The higher the gas pressure builds in a magma,
A) the more explosive the eruption. B) the less explosive the eruption. C) the longer the lava will flow. D) the shorter the lava will flow.
The zone above the water table, in which water is suspended, is the:a
zone of aeration. b. zone of saturation. c. water table. d. ground water. e. aquifer zone
The natural sediments that hold clasts together precipitate in the empty pore spaces after compaction. Those precipitates come from
A. water containing dissolved materials. B. the alignment of clay particles. C. outward growth of the original clasts.
How do scientists estimate the age of the Universe?
A. By measuring speed of light from distant stars B. By measuring the relative motion of other galaxies C. By measuring the age of the oldest known asteroids