because it runs over the Mississippi river
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The fracture type of the Pumice rock is either jagged or splintery. The Pumice has both fracture and cleavage type.
Among many other things, a heartbeat.
AA: jagged chunks of lava formed by rapid cooling on the surface of a lava flow
Friction is a result of the interactions between surfaces that are in contact, more precisely, it arises from microscopic interactions between jagged natures of surfaces. Friction is present even when an item is not moving.
quick answer: An abrasion is damage to the superficial layer of skin; in other words it is a scrape or mild cut. A Laceration is a smooth or jagged open wound; ex) cut by a knife or broken glass, etc... a more severe cut