Cycles in nature

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Food chains

2000
Explains how energy is transferred from plants to animals via the food chain.

Plant life

2000
Explains the growth and reproduction of plants, how dead plant matter is recycled, and how human actions affect plant life.

The four seasons

2007
Explains the science of the changing seasons and describes the unique characteristics of the earth and living things during each one.

The rock cycle

2007
Describes the processes that create rock, such as weathering, compaction, and cementation, and examines igneous, sedimentary, and metamorphic rock.

The phases of the moon

2007
Describes each of the moon's phases, explaining in text and diagrams why the moon appears as it does from Earth.

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