SCIENCE
Rockett, Paul

Seven Quintillion, Five Hundred Quadrillion Grains of Sand on Planet Earth

(4) 4-6 Big Countdown series. Facts about geology and geography are presented through numbers that measure them, including topics such as atmospheric temperatures and geographic distances; geologic time; the lengths of rivers and depths of the ocean; and the amounts of sand, water, and people on earth. Each crowded two-page spread is filled with colorful illustrations of the features and a few small photographs. Reading list, websites. Glos., ind.

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