
The Correct choice is : C. <u>Solids</u>
Sound waves need a medium to propagate, and the most suitable medium for that is solids, where it travel the fastest or with greatest efficiency.
When is reaches the outside of the volcano
The answer is b. a common currency
hope this helps ! :D
A CBRNE incident is one where chemical, biological, radiation and nuclear hazards are present. Thus, you should:
Practice protective measures of time, distance and shielding
Do not enter zone until agent is identified