1) A valley is an area of --- land between two hills or mountains. a) drier b) lower 2) The location of something refers to its ----? a) place or position b) geographical features 3) To be isolated means to be --- other things. a) far away from b) close to 4) When ideas spread, --- people know about them. a) fewer b) more 5) An exchange occurs when one person or company gives something to another, and the other person or company gives --- a) something in return b) thanks 6) Barriers are things that --- two areas or groups of people. a) bring together b) separate 7) To inhibit something is to keep it from --- in the usual or expected way. a) going away b) growing 8) When you prevent something, you --- happen. a) help it b) don't let it

Geography helps explain the success of Silicon Valley

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