The dependence of all living cells on ____ to survive strongly suggests that simple, living molecules originated in the
ocean.
a. fresh water
b. saline water
c. carbon dioxide
d. oxygen
e. methane
b
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The three types of unconformities are ____________________, ____________________, and
____________________. Fill in the blank(s) with the appropriate word(s).
What characterized the Ordovician in terms of invertebrate life, and how does that relate to what was
happening geologically? What will be an ideal response?
What force, perpendicular to the surface, tends to hold material on a slope?
A. Normal force of gravity B. Shear force of gravity C. Friction D. Shear resistance
Seismic gaps represent
A. areas along an active fault where surface indications of the fault are absent. B. "locked" sections along otherwise active faults. C. periods of reduced or no seismic activity in the geologic record. D. areas where there is little or no risk of earthquake activity.