Question

what is silicon valley

Answer 1

Silicon Valley, in the southern San Francisco Bay Area of California, is home to many start-up and global technology companies. Apple, Facebook and Google are among the most prominent. It’s also the site of technology-focused institutions centered around Palo Alto's Stanford University. The Computer History Museum and NASA’s Ames Research Center are in Mountain View. The Tech Museum of Innovation is in San Jose.

Answer 2

it is a velley made of silica I think it is also may call silver because I don't know why it is called so this is this and this is that