"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 oceans are an essential part of our lives"--

"Inside every cell in the human body are tiny molecules that define all of a person's biological traits. Award-winning science author Robert E. Wells explores DNA with curiosity and awe, pairing thrilling facts with clear explanations. Our human DNA might be 99% the same, but that last 1% difference makes each person unique"--

In the Arctic, the summer ice is melting, making it hard for polar bears and their cubs to survive. Why is the world getting warmer? The heat of the sun is trapped by the "greenhouse" gases that surround Earth-carbon dioxide, methane, nitrous oxide, and water vapor. If there is just the right amount of these trapped gases, the air is warm enough for plants, animals, and people to thrive. But, now there is too much greenhouse gas, especially carbon...

The blue whale is the biggest creature on Earth. But a hollow Mount Everest could hold billions of whales! And though Mount Everest is enormous, it is pretty small compared to the Earth. This book is an innovative exploration of size and proportion.

What's faster than a cheetah?-no animal on earth can run faster. But, a peregrine falcon can swoop faster than a cheetah can run. And, the falcon can't compare to an airplane, a rocket, or the speed of light. Lively text and watercolors will make children laugh while they learn all about speed.

What would life be like with no clocks and no calendars? How would you know when to get up in the morning? Long, long ago, all people could do was watch the sun and moon and try to figure things out. Eventually, they made simple clocks like sundials.

If medals were awarded to animals for living a long time, then a giant tortoise would certainly win one. Some giant tortoises have lived for more than 150 years! Still, there are things on this planet much older than giant tortoises. Some of the giant sequoia trees that grow in California would be more than 3,000 years old. But, the trees aren't that old compared to the Barringer Crater in Arizona-that was made about 49,000 years ago. And, it's almost...

How do you lift a lion? With a machine that's big and powerful with clanking metal parts? There are machines like that. But, others have only a few moving parts. In fact, some machines are so simple that they don't seem like machines at all-like the wheel, the lever, and the pulley. These machines can make work easy, even if you're trying to lift a lion!

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.

Explore the world of the VERY small.