Ash from the Tungurahua volcano is seen in Riobamba, Ecuador on April 26, 2011. The country has ordered locals to evacuate towns near the base of the volcanic mountain located in the south, and issued an alert. (AFP/API)

The Tungurahua volcano covered spews ash and steam during an eruption in Ecuador, April 25, 2011. The Tungurahua volcano, which means “Throat of Fire” in Ecuador’s native Quechua language, is one of eight active volcanoes in the Andean nation. REUTERS/Carlos Campana (ECUADOR – Tags: ENVIRONMENT)

A view shows the Tungurahua volcano spewing ash and smoke during an eruption, some 170 km (106 miles) southwest of Quito April 26, 2011. Ecuador on Tuesday closed schools and evacuated towns in areas near Tungurahua, after the volcano spewed ash clouds miles into the air, damaging crops and endangering the health of residents in nearby villages, according to local media. The country’s geophysical institute has reported increased volcano activity since last Thursday, and has detected six eruptions so far. Reuters/Carlos Campania¬† (ECUADOR – Tags: ENVIRONMENT DISASTER IMAGES OF THE DAY)