A Wonderleaf question

a real page from the book
Rain comes from water that rises from Earth, gathers in clouds, and falls back down. Sun warms seas, lakes, rivers, and puddles until some water becomes invisible vapor; higher, colder air turns it into tiny liquid drops.
Those drops drift together inside a cloud, bumping and joining until some grow too heavy for the air to hold. Then gravity brings them down as rain. The same water keeps cycling, so a raindrop today may be very, very old.
Put a cup outside during a shower, then compare the collected rain with water from the tap.
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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