Discusses what the respiratory system is, how it works, and how it may be affected by various diseases.

"Earth's lithosphere is the rigid, outer part of the planet, including the crust and upper mantle. Readers of this informative guide will learn about the types of rock, including igneous, metamorphic, and sedimentary, that make up the lithosphere-and how they come together to form the rock cycle. They'll also see how the movement of tectonic plates inside Earth creates landforms and natural events. Helping to fulfill standards in the earth science...

"The biosphere is the part of Earth where life exists or can exist. It includes all living things on Earth, as well as the nonliving systems that help them survive. Readers of this stimulating volume will learn how people affect the biosphere and how life and energy are maintained in the biosphere. Key elementary science curricula, including concepts such as food chains and life cycles, are reinforced through eye-catching graphic elements and age-appropriate...

The digestive system helps humans get the most out of every meal and drink. It also rids the body of unwanted substances. This close examination explains the ins and outs of the digestive system, including its location within the human body, the organs used in digestion, and ways excreting certain materials benefits the human body. Its colorful photographs, diagrams, fact boxes, and sidebars keep readers interested and offer comprehensive insight

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The human skeletal system is the scaffold for the human body, holding up all the pieces into an amazing functioning unit. This helpful guide to the skeletal system explores the main bones of the human body and introduces the cells, fibers, and other elements that make up each bone. Readers will learn what happens if part of the system is damaged or missing. Through exciting photographs and diagrams, intriguing sidebars, discussion questions, and

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