The human genus, Homo, appeared and evolved through the __.
a. Jurassic
b. Hadean
c. Proterozoic
d. Pleistocene ice age
Ans: d. Pleistocene ice age
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What is a possible way of increasing permeability?
a) seal fractures with clays and other minerals b) fill pores between grains with clays and other fine-grained materials c) fill pores with natural cement d) compact a clay so that the particles are aligned e) none of the above
What is the primary cause of oxygen depletion in the disphotic zone?
a. photosynthesis b. chemosynthesis c. primary production d. buffering reactions e. heterotrophic respiration
What is considered the most structurally complex animal phylum?
a. Chordata b. Echinodermata c. Mollusca d. Arthropoda e. Annelida
The igneous feature shown in this photograph is a
A. dike. B. volcanic neck. C. sill. D. batholith.