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World history

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"Through accessible text and informative photos, readers will explore ports, the backbone of commerce and trade throughout human civilization. Each chapter focuses on an important aspect of these facilities, including the history of ancient ports, the technological advances that have improved shipping over the centuries, profiles of port-related careers, and examples of the most impressive and influential ports of the modern era. Content directly correlates with Next Generation Science Standards, ensuring that young readers will be left with a deeper appreciation and respect for ports and the engineers that create and maintain them."--Provided by publisher.

Harbors --- Harbors.

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Civilization, Western --- Civilization --- History

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Refuse and refuse disposal

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"Today's tunnels, which extend through mountains and underneath oceans and rivers, are marvels of engineering. In this engaging title, readers take a close-up look at these structures and how they are built and maintained. Each chapter will focus on a key area, including the earliest tunnels, the technological advances that have improved their design and construction over time, profiles of tunnel-related careers, and examples of the most impressive tunnels in the world. This book's contents correlate with Next Generation Science Standards, ensuring that young readers will be left with a deeper appreciation and respect for tunnels and the workers that create and maintain them."--Provided by publisher.

Tunnels --- Tunnels.