Using jargon-free language, this dictionary uses illustrations to help children discover the definition of a word or concept, how to use it in its correct context, and to see how scientific laws and principles work. There is also a who's who of key figures and their discoveries, with cross-referencing used throughout. The book looks at scientific investigation, the Earth in space, the structure of the Earth, rocks and minerals, seas and oceans, atmosphere and weather and the human impact.