Which is correct about electromagnetic and mechanical waves?

Electromagnetic waves occur when a charged particle decelerates, but mechanical waves occur when charged particles
accelerate.

Electromagnetic waves are transverse but mechanical waves are longitudinal.

Electromagnetic waves move much slower than mechanical waves.

A mechanical wave needs a medium for its propagation, but an electromagnetic wave can travel through a vacuum.

I think it is the second one if I remember correctly

glacial erosion, the picking up and movement of earth beneath a glacier, is also referred to as plucking. erosion and transportation of individual pieces of bedrock, especially large "joint block occur as a result of this glacial erosion. plucking is type of erosion in which rocks become frozen into the bottom and sides of the glacier.as the glacier moves downhill it 'plucks' the rocks frozen into the glacier from the ground.