The force exerted on the tires of a car to directly accelerate it along a road is exerted by the
A) engine.
B) tires.
C) air.
D) road.
E) none of the above
D
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The global average surface temperature has increased over the last two decades
Indicate whether the statement is true or false
The general chemical equation for photosynthesis is shown below. Through this reaction, is the carbon oxidized or reduced? How can you tell? 6 CO2 + 6H2O ? C6H12O6 + 6 O2
A. Reduced, since in carbon dioxide there are two oxygen atoms for every one carbon, but within the product, C6H12O6, (glucose), there is only one oxygen for every one carbon. B. Oxidized, since carbon is in the +4 oxidation state in CO2 but in the +6 oxidation state in the product, C6H12O6, glucose. C. Neither, since carbon does not change its oxidation state and is neither oxidized nor reduced. D. Both, since the carbon atoms within the glucose molecules display two different charge states.
When examining a surface map, which of the following factors can be used to predict the movement of a surface low-pressure area?
A. orientation of the isobars behind a cold front B. orientation of the isobars in front of warm front C. movement during the previous two hours D. region of greatest pressure decrease
What produces columnar jointing in lava flows? What will be an ideal response?