The igneous feature shown in this figure is a 
A. dike.
B. volcanic neck.
C. sill.
D. laccolith.
Answer: C
Environmental & Atmospheric Sciences
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a) ordovician b) quaternary c) Jurrasic d)Mesosoic
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The most stable layer in terms of temperature and density is the mixed layer
Indicate whether the statement is true or false
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Over the past 50 years, global life expectancy has
A) decreased by about 5 years primarily due to increases in viral infections. B) stayed about the same due to new diseases spread by global climate change. C) increased by about 5 years due to the development of many poor nations. D) increased by more than 20 years due to better health care and nutrition worldwide.
Environmental & Atmospheric Sciences
The longest subdivision of the geologic time scale is the ________
A) epoch B) eon C) era D) period
Environmental & Atmospheric Sciences