Students take cover under their desks during an earthquake drill at the Baclaran Elementary School Unit-1 in Paranaque city, metro Manila Feb 7, 2012. The drill aims to help students and school staff learn how to react properly during high-intensity earthquakes. A magnitude 6.7 earthquake struck the central Philippine island of Negros on Monday, triggering landslides that toppled houses.[Photo/Agencies]

Students cover their heads as they run out of the school building during an earthquake drill at the Baclaran Elementary School Unit-1 in Paranaque city, metro Manila Feb 7, 2012.[Photo/Agencies]