How is mass wasting different from other forms of erosion?
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a. it takes millions of years.
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b. it involves chemical reactions.
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c. it involves physical forces.
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d. it happens suddenly.

the peaceful equids (horses, donkeys and zebras) were enslaved by the human race to do our bidding -- sorry, domesticated -- several thousand years ago, and since that time they've been an invaluable resource for transportation, agriculture, warfare, companionship and sometimes-horrifying entertainment.

your awnser is a.gap junctions