Explores topics including, the properties of solids, liquids, and gases, how liquids become solids and how solids become liquids, how the water cycle works, why seawater is salty, and how changing states make recycling possible.
Earth's landscape is constantly changing, but some geological events have more explosive effects than others. This daring book introduces readers to the power of volcanoes, one of nature's most mesmerizing and disruptive features. Readers will discover how volcanoes form and why they erupt so dramatically. They'll learn about the most infamous volcanoes that have shaped Earth, from Mount Vesuvius's destruction of Pompeii in 79 CE to the disastrous 1980 eruption of Mount Saint Helens.
An introduction to gases, covering kinds of matter, what gas is, how gases are cooled, and more. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.
An introduction to gases, covering kinds of matter, what gas is, how gases are cooled, and more. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.
Students illustrate changes in matter with simple experiments and show that matter can change states between solid, liquid and gas by adding or subtracting heat.
