A Wonderleaf question

a real page from the book
Most reference books still name Africa’s Nile as Earth’s longest river, running about 4,132 miles to the Mediterranean Sea. Some scientists argue the Amazon is a little longer if you count its farthest mountain stream as the start, so the answer depends on the measuring rule.
That is the part kids often love: rivers are not tidy lines on a map. They grow from springs, rain, snowmelt, and side streams. The Amazon may lose the length contest in many books, but it carries more water than any other river.
Trace a blue string across a map, adding bends, then compare it with a straight ruler line.
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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