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DK Science: Populations

FAMILY MEMBERSUNITED PROTECTIONCOLONIAL ORGANIZATIONFIND OUT MOREAnimals of the same animal species, living in the same area, and interbreeding with one another, are referred to as a population…

naval science

(Encyclopedia) naval science: see strategy and tactics.

DK Science: Machines

LEVERSWHEELSFIND OUT MOREPULLEYSSCREWSGEARSFIND OUT MOREIn science, a machine is any device that changes a force into a bigger or smaller force, or alters the direction in which a force acts.…

DK Science: Minerals

MINERAL PROPERTIES MINERALS IN ROCK CRYSTALS FIND OUT MORE Minerals are the materials that make up the rocks of the Earth’s crust. Among thousands of different minerals, only a few,…

DK Science: Fish

FILTER FEEDERAFRICAN LUNGFISHJAWLESS LAMPREYFISHFIND OUT MOREFish are water animals that evolved about 500 million years ago. They were the first animals to have an internal skeleton. Most fish…

DK Science: Palaeontology

DINOSAUR FOOTPRINTS FOSSILS FIND OUT MORE The study of ancient life, known from FOSSILS, is called palaeontology and scientists who work in this field are known as palaeontologists. By…

DK Science: Amphibians

AMPHIBIAWET FROGFROGSPAWNFIND OUT MOREAmphibians generally start life in water, but later change so that they can live on land. Most return to the water to mate. The life cycle involves…

DK Science: Jupiter

THE GALILEAN MOONSJUPITER’S ATMOSPHEREJUPITER’S LIGHTSFIND OUT MOREJupiter is the biggest planet in our Solar System, eleven times bigger in diameter than Earth and two and a half times more…

DK Science: Neptune

BLUE PLANETNEPTUNE’S RINGSTRITON’S GEYSERSFIND OUT MOREAlmost the same size and colour as Uranus, Neptune orbits about 1.6 billion km (1.0 billion miles) further from the Sun than Uranus.…