Recent research by Ravizza and colleagues suggests that students may spend as much as one- typical class hour browsing the internet.
half
third
fifth
quarter
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one-half

Explanation:

According to that study done by Susan Ravizza and her colleagues students spent almost 40 minutes browsing the internet for nonacademic purposes. Since one class period is 100 minutes this would put it at almost one-half of the class period. They also found that the students used their phones for texting for around 27 minutes.

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.