Give 2 example each of 1 way rotary motion and reversible rotary motion

Could someone me find the answer to this problem.

Which type of basaltic lava flow has a fairly smooth

What would be the result of an alpha particle coming into a magnetic field? a) the alpha particle will stop moving. b) the alpha particle will reverse its direction. c) the alpha particle will be deflected in a curve path. d) the alpha particle will continue to travel in a straight line.