Strategies used to reduce impacts of volcano (mount etna)

ANSWER:

Strategies used to reduce impacts of volcano are to listen for emergency information and message about the event.

EXPLANATION:

Volcanoes is defined as the eruption or the rupturing the plates which is attached to the earth. The process will allow certain particles to be released during the process such as hot lava, volcanic ash. So these disasters could be prevented from follow certain procedures. People should not go to the area which are downstream of the eruption. It is suggested not to drive in these heavy ash fall.

Your correct the answer is d

81 is a composite number