Answer: By far the most abundant volcanic gas is water vapor, which is harmless. However, significant amounts of carbon dioxide, sulfur dioxide, hydrogen sulfide and hydrogen halides can also be emitted from volcanoes.
Below is an overview of materials that make their way from volcanic eruptions into the atmosphere: particles of dust and ash, sulfur dioxide, and greenhouse gases like water vapor and carbon dioxide.
"David / staying a few days in San José Question 2 with 1 blank Laura / not leaving too late Question 3 with 1 blank 1 blank Cecilia / be careful crossing the streets Question 6 with 1 blank Simón / learn to dance in Costa Rica."
