An introduction to the tundra, Earth's coldest and most fragile biome, looking at the living and nonliving environment of the tundra, discussing the effects of the human presence, and considering the future of the tundra.
Contains alphabetically arranged entries that provide information about common prescription, over-the-counter, and recreational drugs, and discusses topics related to drug and alcohol use and abuse.
Photographs and simple text introduce readers to pigeons, describing how they survive in an urban habitat, discussing their diet and life cycle, and explaining what effects pigeons have on their human neighbors.
Explains the concept of velocity through a series of examples involving severe weather. Presents mathematical equations for determining the speed and strength of severe storms.
Presents a guide to optical patterns and symmetry, in simple text with illustrations, including information on the artist M.C. Escher, tessellation, Islamic art, and math.