This week’s subject: Earthquakes

California’s White Mountains have been rocked by earthquakes this month. And more than 1,000 quakes hit the Mammoth Lakes area in a 30-hour period. But scientists are concerned that the recent quake swarms could presage a bigger shift in the Earth’s crust. To lean more about earthquakes and earthquake safety students and others can use the direct links on The Times’ Launch Point Web site at https://www.latimes.com/launch/