An eraser makes tiny crumbs that lift pencil marks right off the paper.
When you rub, the eraser grabs the little bits of graphite. That is why crumbs are left behind!
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A pencil writes with a soft grey material called graphite, not lead.
Most pencils have six flat sides so they don't roll off the desk.
Paper is made from trees that are turned into soft, mushy pulp.
Crayons are made from colored wax that can melt if it gets too warm.
One pencil can draw a line about 55 kilometres long.