A Wonderleaf question

a real page from the book
Dirty water is cleaned by moving it through steps that remove waste bit by bit. Screens catch large objects, tanks let grit sink, bacteria eat dissolved muck, filters trap fine specks, and disinfection kills germs before the water returns to rivers or pipes.
One lovely truth is that some of the hardest workers are too small to see. In the treatment tanks, bacteria feed on leftovers from soap, food, and sewage, turning invisible mess into clumps that can settle out. Clean water is teamwork, gravity, air, and time.
Pour muddy water through a coffee filter or cloth and notice what it catches and what still passes through.
Watercolour scenes, straight answers, about three minutes cover to cover.
Open the picture bookOne more wonder: Why is space so dark?
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