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Science Reference Center
Full-text articles to support research in applied sciences, biology, chemistry, earth and space science, and energy. Includes the Science Image Collection, a database of high-quality science images from National Geographic, UPI, Getty, NASA, and Nature Picture Library.
4) Levers
Author
Language
English
Description
Uses everyday examples to describe levers as simple machines used to lift, push, or move a load.
6) Pulleys
Author
Language
English
Description
Uses everyday examples to describe pulleys as simple machines that make lifting, pulling, and moving easier.
8) Screws
Author
Language
English
Description
Uses everyday examples to show how screws are simple machines that make joining things together, moving, and lifting easier.
9) Stegosaurus
Author
Series
Language
English
Description
Discusses the physical characteristics, food, habitat, relatives, and extinction of the slow-moving vegetarian dinosaur, Stegosaurus.
11) Triceratops
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Series
Language
English
Description
Discusses the physical characteristics, habitat, food, defenses, relatives, and extinction of the triceratops.
13) Velociraptor
Author
Series
Language
English
Description
Discusses the physical characteristics, habitat, food, defenses, relatives, and extinction of the small but fierce meat-eating dinosaur that lived in prehistoric times.
14) Wedges
Author
Language
English
Description
Uses everyday examples to show how wedges are simple machines that make pushing, pulling apart, and lifting easier.
16) Wheels and axles
Author
Language
English
Description
Uses everyday examples to show how wheels and axles are simple machines that make carrying, pushing, and mixing easier.
20) Soil
Author
Series
Language
English
Description
Discusses the different types of soil, its properties, erosion, pollution, and how humans can protect soil.