What are anticlines and synclines and how are they identified?
Anticlines and synclines are up- and down-arched folds, respectively. They are identified by strike and dip of the folded rocks and the relative ages of rocks in these folds.
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Weathering is classified as either mechanical or ____
A)carbolic B)inorganic C)chemical D)hydrolytic E)physical
Only 5% of the Earth's land is strictly protected from human activities. With this level of protection, which of the following statements is the reason that so many land species are increasingly threatened with extinction?
A. Because conservation biologists say we need to strictly protect 20%. B. Because so much land is being lost to flooding from rising sea levels. C. Because of reduced sunlight from atmospheric pollution. D. Because of a dramatic increase in earthquakes and volcanoes.
How many valence electrons does boron (B, atomic no. = 5 ) have?
A) 1 B) 2 C) 3 D) 4 E) 5
The planetary albedo of the earth is:
A) 7%. B) 15%. C) 30%. D) 50%.