Walking along the pebble beach at Half Moon Island, Chris Edwards, a geologist from Scotland, says the changes are obvious.

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The route is simple: a straight out departure, staying left of the 101 freeway, past San Carlos Airport, past SFO airport, through South San Francisco, and into downtown San Francisco, over the Oakland Bay Bridge, past Alcatraz Island, over the Golden Gate Bridge, then south following the coastline to Half Moon Bay and back east to PAO.

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