Which m50 gas mask accessory should be used if storing the mask for more than 30 days?

Face Form

Explanation:

A face form is used for storing a mask for greater than 30 days. The main role of face foam is to maintain the shape of the mask

M- 50 FPM is  used to provide 24 hours protection against chemical , radioactive effects and also from biological agents. IT has several accessories out of which face form is one which is used only when mask is to preserved for a long period of time.

answer:

convection currents in the magma drive plate tectonics. heat generated from the radioactive decay of elements deep in the interior of the earth creates magma (molten rock) in the aesthenosphere. the aesthenosphere (70 ~ 250 km) is part of the mantle, the middle sphere of the earth that extends to 2900 km.