Most deserts lying around 30 degrees latitude are caused by
A) rain shadows
B) great distances from precipitation sources
C) descending air
D) upwelling of cold waters along coastlines
C
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The symmetry in worms represents the transition from simple to advanced organisms
Indicate whether the statement is true or false
What is the most important aspect of future oil supplies?
A) when the supplies will be exhausted B) how much remains C) when oil production will peak D) how clean newly found oil reserves will be
As successional changes occur in an ecosystem, new species take advantage of new conditions. Where do these new species come from?
A) They evolve from other species in the immediate region. B) They come from surrounding ecosystems in other stages of succession. C) They are planted by forest rangers who are managing these forest ecosystems. D) The seeds of the new species are carried in by large streams and rivers.
What water mass is the most saline in the world ocean?
a. Antarctic Bottom Water b. Northern Atlantic Deep Water c. Northern Pacific Deep Water d. Mediterranean Deep Water e. Arctic Bottom Water