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DK Science: Sediments

DEPOSITIONFIND OUT MOREThe rocky material that is transported and DEPOSITED by rivers, seas, glaciers, and the wind is called sediment. Clay, sand, and gravel are all types of sediment.…

The U.S. Highway System

At the beginning of the 20th century, an uninterrupted system of nationwide highways did not exist. Beginning in 1811, a National Road had been constructed between Cumberland in western Maryland…

AIRCRAFT

AIRLINERSHELICOPTERSFIND OUT MOREBoth aeroplanes and HELICOPTERS are aircraft. These machines use engines and aerofoil wings to lift off the ground and move through the air. Aeroplanes use…

DK Science: Transpiration

UPWARD-FLOWING WATERSTANDING FIRMSTOMATAFIND OUT MOREIn this process, water evaporates from the surface of a leaf through microscopic pores known as STOMATA. The loss of water creates a…

DK Earth: Weather

WHAT CAUSES THE WEATHER? FORECASTS FIND OUT MORE Weather is what is happening in the atmosphere now, at any place on Earth’s surface. It includes the temperature and whether it is wet and…

DK Human Body: Brain

WHY IS THE HUMAN BRAIN SPECIAL? WHAT IS THE BRAIN MADE OF? HOW DOES THE BRAIN WORK? BRAINWAVESFIND OUT MOREThe largest organ in the nervous system is the brain. It controls vital involuntary…

Famous Star Gazers

Eratosthenes 276–195 B.C. This Greek astronomer was the first to measure the size of Earth accurately. He determined that the earth's polar diameter was about 7,850 miles. (In fact, the distance is…

The Flap Over Pluto

Sources: NASA and the International Astronomical Union. News Flash (August 24, 2006)—Pluto Demoted! Read About It Here. Misleading reports that Pluto was about to lose its status as a planet in…