If you toss a rock into a lake what happens to the rock as it sinks

The rocks mass will stay the same as the rock will sink and erode as it ages in the water. Hopefully my answer is useful.

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as a general rule, scissors have blades less than 6 in (15 cm) long and usually have handles with finger holes of the same size. shears have blades scissors used to cut hair or fabric must be much sharper.