The pH scale is a quantitative representation of the relative amounts of ________
A) hydrogen and hydroxyl ions in solution
B) hydrogen and polar water molecules in solution
C) water and carbon dioxide molecules in solution
D) hydrogen and oxygen ions in solution
E) alkaline and basic ions in solution
Answer: A
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How does petrified wood form?
a. permineralization – silica rich waters percolates and silicifies the wood b. aeration – the wood dries out and is then buried c. decomposition – bacteria break down the wood and replace them with organic compounds d. decomposition – bacteria break down the wood and replace it with inorganic compounds e. tectonism – wood is rapidly buried and subsequently uplifted
Mineralogically and chemically equivalent rocks are ________ and ________.
A. mafic; ultramafic B. felsic; intermediate C. diorite; andesite D. granite; diorite E. gabbro; basalt
What percentage of the Earth's land surface is currently covered by glacial ice?
A) 2% B) 10% C) 15% D) 33%
Vortices within a tornado vortex, called suction vortices, often cause the greatest destruction within a given tornado
Indicate whether the statement is true or false