when did the last major volcanic activity take place?
1985
Nevado del Ruiz
At 3:06 pm, on November 13, 1985,
what type of eruption does nevado del ruiz produce The volcano usually generates Vulcanian to Plinian eruptions can you explain the first one? It is a type of volcanic eruption characterized by a dense cloud of ash-laden gas exploding from the crater and rising high above the peak and what kind of material does the second one eject? It ejects  Pumice where is the above mentioned volcano located? It is located on the border of the departments of Caldas and Tolima in Colombia, about west of the capital city Bogotá how old is it in terms of volcanic activity? UNANSWERABLE what kind of vegetation does this mountain support? The vegetation is dominated by plants such as bunchgrass and Espeletia. what kind of a plant is the second one? It is a genus of perennial subshrubs, in the sunflower family why was it named as such? he genus was named after the viceroy of New Granada, José Manuel de Ezpeleta how long was he the viceroy for there? Till 1810 has anyone ever summitted the above mentioned mountain? UNANSWERABLE
wiki:12124999
Nevado del Ruiz [SEP] Eruption and lahars
It also destroyed a small lake that was observed in Arenas crater several months before the eruption. Water in such volcanic lakes tends to be extremely salty and contain dissolved volcanic gases. The lake's hot, acidic water significantly accelerated the melting of the ice; this effect was confirmed by the large amounts of sulfates and chlorides found in the lahar flow. The lahars, formed of water, ice, pumice, and other rocks, mixed with clay as they travelled down the volcano's flanks. They ran down the volcano's sides at an average speed of 60 km per hour, eroding soil, dislodging rock, and destroying vegetation.