Question

1. volcanic eruptions are hard to predict, but volcanologists, geologists who study volcanic formation and eruption, take several measurements that together make reliable predictions. the chart shows two daily measurements, the number of earthquakes per day and the tilt mounted to a fixed point near a known fault line. slight upward trends indicate warnings that an eruption may be forming, while drastic increases in both measurements indicate a watch condition where an eruption is imminent. drag and drop the tiles to indicate the three phases of the alert system: normal, watch, and warning.

volcano eruption early warning
cumulative earthquakes (×10)
sep oct nov
tilt per day (micro radian)
normal state warning state
drag and drop the correct choice into the drop areas on the image above
watch state

Explanation:

To determine the phases:

1. Normal State: Both measurements (earthquakes, tilt) are stable/low. The first tile (1) is Normal.
2. Watch State: Drastic increases in both measurements (imminent eruption). The third tile (3) should be Watch State (since 2 is Warning, and normal is 1, 3 fills the middle phase with drastic changes).
3. Warning State: Slight upward trends (forming eruption). The second tile (2) is Warning.

So, drop "Watch State" into tile 3.

Answer:

Drop "Watch State" into the drop area for tile 3. The phases are:

1. Normal State
2. Warning State
3. Watch State