Scientists can observe primary productivity in the ocean from space by measuring the ____
A) temperature of the surface water
B) depth of the euphotic zone
C) amount of chlorophyll in surface waters
D) salinity of surface waters
C
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Why do scientists formulate principles?
A) to describe a widely applicable and generally accepted explanation for natural phenomena B) to explain something that cannot be observed or measured by scientific procedures C) to make a statement or mathematical formula that always succeeds in generalizing data and observations about data without necessarily offering an explanation D) to explain a problem that accounts for existing data and predict additional phenomena that should exist
How does a suspension differ from a solution?
A. Although a solution and suspension are both homogeneous mixtures, only the components of a suspension will separate by spinning the mixture in a centrifuge. B. A suspension is a heterogeneous mixture consisting of different phases, whereas a solution is a homogeneous mixture consisting of a single phase. C. A suspension is a heterogeneous mixture whose components can be separated by simple filtration. A solution is a homogeneous mixture which cannot be separated by simple filtration. D. The difference between a suspension and a solution can only be determined by chemical means.
In comparison to an ocean basin, the crustal root of a mountain range is:
a. deep and very dense b. deep and of lower density than the surrounding rocks c. shallow and very dense d. shallow and of lower density than the surrounding rocks
Acid precipitation is especially disruptive when it occurs in areas with ________ because of the lack of ________.
A. Limestone in the soil; buffering capacity B. Crystalline bedrock; buffering capacity C. Alkaline soils; acid resistant mosses D. Alkaline soils; buffering capacity E. Crystalline bedrock; acid resistant mosses