Books with author Helen Challand

A discussion of the properties of electricity, with several related experiments, and an introduction to different kinds of batteries

Suggests experiments introducing magnets and magnetism, demonstrating the magnetic field and the properties, strength, and uses of magnets

Examines the ecological role of wetlands and discusses how they are formed, what life they support, and how people modify or destroy them.

Suggests experiments introducing magnets and magnetism, demonstrating the magnetic field and the properties, strength, and uses of magnets

Examines the characteristics of simple plants that do not have seeds, including algae, fungi, lichen, mosses, and ferns, with a brief look at bacteria

An introduction to the principles and concepts of the life sciences through a wide variety of scientific activities and experiments

A discussion of the properties of electricity, with several related experiments, and an introduction to different kinds of batteries

Activities and experiments--such as making charcoal, measuring shadows, and calculating the speed of sound--in the areas of astronomy, weather, and geology.

Briefly describes the earth's interior, the forces and stresses that sometimes cause the ground to shake, and the effects of such movement

A brief introduction to chemistry, discussing atoms, molecules, the periodic chart, chemical changes, and states of a matter. Includes simple experiments.

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Discusses what causes volcanoes, where they are likely to occur, and how scientists study them.