Which of the following is not true of greenhouse gases?
a.
they absorb earth’s radiation.
b.
they are produced solely by human activities.
c.
they are transparent to incoming solar radiation.
d.
they include carbon dioxide and water vapor.

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.