Dive! Dive! Dive!: Buoyancy
Blackout! Castle Under Siege! Wackiest Machines Ever! These books take an exciting new approach to physical science curriculum topics, including materials and their properties, simple machines, energy, forces and motion, electricity, sound and light, and gravity. Raintree Fusion is high-interest nonfiction aligned with curriculum, at a reading level accessible to struggling readers.
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Enemy in Sight
tInside a Submarine
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amount of water ballast tanks big big tanks inside blades that push buoyant force force buoyant force pushes burns diesel fuel center of Earth conning tower denser than water diesel engine machine dive electric engine machine empty space inside enemy ships fill more space fired underwater force that pushes fuel to release gravity force help the crew hollow submarine hull metal body hydroplane inner hull inside a submarine kilometers per hour long tube lined lookout sailor looking machine that releases machines that help miles per hour object divided periscope long tube place periscope long propeller spinning blades pulls everything pulls the submarine push a submarine push or pull release energy seawater steer the submarine submarine downward submarine is underwater submarine sinks submarine through water submarine weighs submarine-sized amount submarine's batteries surface tanks big tanks tools and machines turn the propeller wartime submarine water it displaces water push back Weight pulls