قياس النشاط البركاني وسبب قوة بركان

🌋 Monitoring Mount Vesuvius

(1)
Volcanologists constantly monitor any changes in levels of seismic activity on Vesuvius because they know that the increase of activity in the deep reservoir of magma causes both earth tremors and volcanic eruptions. Through measuring seismic activity, these scientists expect to predict an approaching eruption months before it happens.

(2)
The seismic activity of Mount Vesuvius happens again and again, and the longer the intervals between eruptions, the greater the next explosion will be. The frequent but low-level activity of Vesuvius in recent centuries has relieved the build-up of pressure. The catastrophic magnitude of the eruption of AD 79 was connected with the extended period of inactivity before it.

📝 Questions

1. According to Paragraph (1), which of the following is TRUE?
   A. Seismic activity is NOT linked to volcanic eruptions.
   ✅ B. By measuring seismic activity, it is possible to predict a volcanic eruption.
   C. It is NOT possible to predict when a volcanic eruption may occur in Vesuvius.
   D. Earth tremors and volcanic eruptions happen in Vesuvius every couple of months.

2. According to Paragraph (2), why was the eruption in 79 AD so severe?
   A. There is evidence that the pressure released over centuries.
   B. There is always a severe eruption there every hundred years.
   ✅ C. There was a long period without seismic activity and then it started again.
   D. There was a continuous but growing amount of seismic activity in the area.