Question

read the text. mount pinatubo is a volcanic mountain near manila, the capital of the philippines. in may 1991, scientists noticed that pinatubo was showing signs of an impending eruption. consequently, people were soon evacuated from the area. on june 12, the first major eruption occurred, spewing ash into the air. the volcano continued erupting on and off until june 15, when it exploded in the second - largest eruption of the twentieth century. the eruption was the cause of the summit collapsing into a caldera, or volcanic crater, nearly two miles across. meanwhile, tropical storm yunya was passing over the philippines. the storm brought a huge amount of rain, which mixed with the volcanic ash. as a result of the heavy ash mixture, roofs collapsed in the area. match causes with their effects. people were evacuated. the volcano erupted. rain and ash mixed together. cause effect scientists saw signs of an impending eruption. a caldera formed. roofs collapsed.

Explanation:

The text states that when scientists noticed signs of an impending eruption, people were evacuated. The volcano erupting led to the formation of a caldera. When rain and ash mixed, roofs collapsed.

Answer:

Scientists saw signs of an impending eruption - People were evacuated.
The volcano erupted - A caldera formed.
Rain and ash mixed together - Roofs collapsed.