What must happen before any work may be performed in a confined space?

Well you need it to be clean, 2 you need space where it is, 3 you need to prepare for what you are about to do,

where the right clothes and gear,tools, anything you need for it.

4th make sure you can concentrate on what you need to do and that there is no distractions, 5th make sure your ready and not stressed,

6th get help if you need a tutor etc

also i will update if i have anything else to say

“when two plates carrying continents collide, the continental crust buckles and rocks pile up, creating towering mountain ranges. when an ocean plate collides with another ocean plate or with a plate carrying continents, one plate will bend and slide under the other. this process is called subduction. “ i found this on google i hope it

4. 50x10= 500m/s 5. 52m/s