How do scientists know dark matter exists? It gives off dark energy.

It causes temperature
increases in areas where it exists.

it causes a greater red shift than ordinary matter.

It creates gravitational effects that can be measured.

maybe 2nd one is correct

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.