Subjects: activities biology mastering web. 1  Click to Rate Hated It. 2  Click to Rate Didn't Like It. 3  Click to Rate Liked It. 4  Click to Rate Really Liked It. 5  Click to Rate Loved It. 6  4.5 1.
California's Central Valley is a large, flat valley that dominates the geographical center of the U.S. state of California. It is 40 to 60 miles (60 to 100 km) wide and stretches approximately 450 miles (720 km) from north-northwest to south-southeast, inland from and parallel to the Pacific Ocean coast.
Grass Valley, which was originally known as Boston Ravine and later officially named Centerville, dates from the California Gold Rush, as does nearby Nevada City. When a post office was established in 1851, it was renamed Grass Valley the following year for unknown reasons.The town incorporated in 1860.rass Valley is the location of the Empire Mine and North Star Mine, two of the richest mines in California.