GEOLOGY

Detailed explanation-1: -Which of the following volcano hazards is made up of rocky particles about the size of a grain of sand? Volcanic ash is made up of rocky particles about the size of a grain of sand.

Detailed explanation-2: -Tephra and ash are composed of varying sizes of rock particles ejected into the air from volcanic eruptions. Tephra refers to larger rock fragments (from pebbles up to the size of a car or house) that typically land close to the volcano, while ash is made up of small particles (sand size or smaller).

Detailed explanation-3: -Volcanic ash is also fine but more gritty, with particles up to the size of grains of rice. Cinders, sometimes called scoriae, are the next in size; these coarse fragments can range from 2 mm (0.08 inch) up to about 64 mm (2.5 inches).

Detailed explanation-4: -Several hazards may affect the area around the volcano, such as lava flows, pyroclastic flows, lahars, jökulhlaups and landslides or debris avalanches. Volcanic activity also produces hazards that can affect areas far from the volcano, such as tephra or ash falls, releases of gas and tsunamis.