What is used to determine the age of a rock in years?
A. Gravity
B. Solar radiation
C. Radioactive elements
D. Heat
Answer: C
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If you observe a disconformity, you would infer that the region had experienced ________
A) deposition of sedimentary layers on crystalline igneous or metamorphic rocks that are exposed at the surface of the earth. B) uplift and tilting of sedimentary units that exposes them to erosion over a period of time with subsequent renewed deposition C) intrusion of igneous rocks into a depositional setting, forcing the sedimentary layers upward and possibly deforming them, followed by subsidence of the remaining sedimentary layers and renewed deposition D) deposition in shallow water, uplift or lowering of sea level enough to expose the rocks to erosion and non-deposition for a period of time, and subsequent resubmergence of the remaining sedimentary units where they experience new deposition
What prevents rocks in the mantle from melting?
A. Temperature B. High iron content C. High sulfur content D. Pressure
Many proponents of sustainability believe that encouraging local self?sufficiency is important for building sustainable societies because ________
A) when people are tied more closely to the area they live in, they will value the area more and seek to sustain its environment and its human communities B) this is not correct; proponents of sustainability believe that encouraging local self?sufficiency will pose a threat to building sustainable societies C) it forces citizens to look more closely at the global community D) it eliminates governmental influence on local practices E) more and more people are growing gardens
The thinnest structural layer within Earth is the:
a. crust. b. inner core. c. outer core. d. lithosphere. e. mantle.