Predicting volcanic eruptions is never easy. For centuries, [volcanology / volcanologists] and seismologists have studied the activity [behest / beneath] Earth that might indicate an eruption. Forecasting when a volcano might erupt has been somewhat [reliability / unreliable] . However, scientists from NASA and the Smithsonian Institution say they are a [step / steep] closer to providing more accurate forecasts of when a volcano might [bellow / blow] . NASA used images from space to [detect / defect] changes in the colour of leaves. The research was [biased / based] on a 2019 study from McGill University. This study showed that an increase [on / in] carbon dioxide levels emitted by two active volcanoes in Costa Rica had an impact [in / on] the colour of leaves [in / at] the surrounding areas.
Current [methods / method] of predicting an imminent volcanic explosion include checking seismic activity, changes in [grind / ground] height, and carbon dioxide and sulphur dioxide [remissions / emissions] . NASA said the new method of monitoring changes in the colour of [foliage / foil] from space could help in foretelling eruptions. The science behind this is [fair / fairly] straightforward. As magma moves upwards through Earth's [crumb / crust] , it releases carbon dioxide. Trees [absorb / absorption] this and their leaves become greener and [mere / more] vibrant. The LiveScience website said: "These signs can help to protect communities against the worst effects of volcanic [blisters / blasts] , including lava flows, ejected rocks, ashfalls, mudslides, and [toxic / hypoxic] gas clouds."
