List the two techniques that are most commonly used to mine coal: ___________ and
_________. Fill in the blank(s) with the appropriate word(s).
underground mining and open pit (surface) mining
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How does connecting a metal like iron with a wire to a metal that is easier to oxidize like zinc help prevent corrosion of the iron?
A. There is no salt-bridge, so there is no reaction between the two metals. B. The wire is acting as an oxidant and keeps the two metals from undergoing other chemical reactions. C. The other metal absorbs the electrons from the iron, which keeps the iron from undergoing oxidation. D. The other metal is oxidized and adsorbs all the oxidant, keeping it away from the iron. E. The other metal is oxidized instead and the electrons travel to the iron, keeping it from oxidizing.
What is the parent rock for the following metamorphic rocks: marble: ____________________;
anthracite: ____________________; quartzite: ____________________; slate: ____________________; schist: ____________________; and greenstone: ____________________. What will be an ideal response?
Ammonites of the Mesozoic were characterized by a very ____
A)restricted duration in time B)complex indenture pattern C)complex feeding mechanism D)complex growth suture pattern E)complex locomotor mechanism
In the Netherlands, bicycles account for ____ of all urban trips.
A. one-tenth B. one-fifth C. one-third D. two-thirds E. three-quarters