A ________ is a tabular (thin but large area) intrusive body that is concordant (parallel to the host rock structure).
A. mantle
B. threshold
C. sill
D. neck
E. dike
Answer: C
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Climate evidence dating back 160,000 years indicates a close correlation between the concentration of carbon dioxide in the atmosphere and global temperature.
Answer the following statement true (T) or false (F)
In a particular chemical reaction 3 bonds are broken and 4 bonds are formed. Based only on this information, which of the following is true?
A) The reaction has a high activation energy. B) The reaction is endothermic. C) the reaction is exothermic. D) We cannot determine which of the above is true.
The method of determining latitude in the Northern Hemisphere by measuring the angle between an observer's line of site to the North Star and line of site to the northern horizon was developed by ________
A) Pytheas B) Eratosthenes C) Herodotus D) Seneca E) Ptolemy
Which numbered area on this geologic map of North America consists of recently added tectonic terranes?
A. 1, southern Alaska B. 2, continental platform of west-central Canada C. 3, continental shield of eastern Canada D. 4, coastal plain along the Gulf Coast of the U.S.