Why are boudins and pinch-and-swell structures less common than folds in deformed metamorphic rocks?
What will be an ideal response?
Ans: Boudins and pinch-and-swell structures are less common because (a) they can only form in non-Newtonian media, (b) buckling may form by amplification of initial layer irregularity during layer-parallel shortening, while extension will simply open such irregularities, and (c) folds can form by passive mechanisms, while classical boudins can not.
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Subsidence inversions:
A) are less important than frontal inversions. B) often lead to increased pollution in Los Angeles. C) are common on the windward slopes of large mountain ranges. D) are common on the western margins of large high-pressure areas.
In a region with semidiurnal tides, if a high tide occurs at midnight (12 AM), the next low tide will occur at: a. 12:50 AM the following day
b. 12:25 PM. c. 6:12 AM. d. 6:37 PM.
What is the projected population of Earth in 2050?
A. 95 billion B. 95 million C. 9.5 billion D. 950 billion
The slow shifting of the continents and the ocean floors is explained by ____
a. Milankovitch theory b. chemical weathering–CO2 feedback c. the Theory of Plate Tectonics d. the Maunder minimum e. the greenhouse effect