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"Our five oceans cover about 71 percent of the earth's surface and hold about 97 percent of our water. Oceans are also home to more than 16,700 kinds of fish and other sea creatures and plants. Together with the water cycle, currents, and balance of temperature and gases, the oce...
This new anthology brings the female crime writers who inspired Agatha Christie out of her shadow and back into the spotlight they deserve. The success of writers like Anna Katherine Green in America; L. T. Meade, C. L. Pirkis, the Baroness Orczy, and Elizabeth Corbett in England...
"Even though rain forests take up less than 10 percent of our world's land, more than half the world's plants and animals live in those rain forests, and the Amazon rain forest is our largest tropical rain forest. Its size alone makes it important, but its size is only a small pa...
Explores the wonderful world of zeros and tells how the googol came to be named.
In this work about the water cycle, readers discover that the molecules in their glass of water may have once been part of a dinosaur watering hole.
Illustrates the concept of big, bigger, and biggest by comparing the physical measurements of such large things as a blue whale, a mountain, a star, and the universe.
Explains why the changes people make to the environment put plants and animals at risk for extinction and outlines steps that can be taken to save them.
Explains why the changes people make to the environment put plants and animals at risk for extinction and outlines steps that can be taken to save them.
Learn why the Earth is heating up and threatening the polar bears.
Provides a simple introduction to the use of levers, pulleys, and wheels to move heavy objects.
By focusing on the needs of an elephant, it shows just how important the sun is to life on Earth.
Compares the speed of various animals, from humans to cheetahs to peregrine falcons, with even faster things like rockets, meteroids, and light.
Learn why the Earth is heating up and threatening the polar bears.
Learn why the Earth is heating up and threatening the polar bears.