Nearly half of Mars dust consists of silica, which on Earth is known to cause silicosis, an incurable lung disease that progressively scars lung tissue. The Martian silica particles measure about 3 ...

According to the National Seismological Network, Costa Rica is a country with more than 120 volcanic sites, but most are extinct, with only five remaining active: Poás, Rincón de la Vieja, Arenal, ...

You could see the volcano so clearly.” Llumiquinga is one of Ecuador’s top trail runners. She sits in a small lodge at the base of Turrialba, a 10,958-foot volcano in Costa Rica. A sharp wind ...