Humus is ________
A) a mixture of living organisms and their waste products
B) light colored or nearly white
C) an indicative of poor soils
D) partially decomposed organic matter
E) poisonous to soil microorganisms
Answer: D
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Why is granite considered a coarse-grained felsic rock?
A) It contains a lot of feldspar and silica. B) It contains little feldspar and silica. C) It contains a lot of magnesium and iron. D) It contains a lot of feldspar and a little silica.
Which of the following accurately describes 18O/16O ratios of ice sheets?
A) During warmer periods, 18O evaporates more readily and therefore the 18O/16O ratio is higher. B) The higher the ratio of ice core 18O/16O, the cooler there temperatures because the 18O will be locked up in ice sheets. C) During periods of colder temperature, the 18O/16O ratio is higher because only the 18O isotope is being evaporated. D) During warmer periods, 16O evaporates more readily and therefore the 18O/16O ratio is significantly lower than colder periods.
What earth system interaction cause auroras?
A. Hydrosphere-Atmosphere B. Exosphere-Atmosphere C. Atmosphere-Atmosphere D. Geosphere-Atmosphere
The first scientist to use a telescope for astronomical purposes was ________
Fill in the blank(s) with correct word