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In the other case some other force such as trench pull would pull the lithosphere and drag would induce movement in the asthenosphere below, which would diminish downwards, and the relative sense of motion between the two would be the opposite. The second possibility ignores the possibility that some other motion could exist in the asthenosphere due to mantle convection, and treats the asthenosphere as passive. receiversatellite In other words, the arrows in the decoupled case only show the movement component in the asthenosphere that would be created by drag as the over riding plate moves and not movements due to other causes.Possible driving forces for plate tectonicstrench pull (covered earlier).ridge push (sliding off a high, oceanic crust in compression).variants of polar fleeing forces).Lava lake videos that demonstrate possibilities on a small scale:Conduction vs. free to air Master Gardeners are available to help with your gardening questions and plant problems. Bring sample...