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When rocks change because of environmental conditions, the new rocks are called metamorphic rocks. A rock's chemical or physical makeup may change because of conditions such as temperature, stress, or pressure. Your readers will learn fascinating facts including where metamorphic rocks are most commonly found, the different types of metamorphism, and how metamorphic rocks are identified. Full-color photographs depict these rocks in nature. A helpful graphic organizer shows how these fascinating rocks form.

Explains the basic science of flight, the problems of getting vehicles into the air, different types of engines, and aircraft design, and includes instructions for making aircraft models.

In 1848, gold was discovered in California, attracting over 300,000 people from all over the world, some who struck it rich and many more who didn't. Hear the stories about the gold-seeking 'forty-niners!' With black-and-white illustrations and sixteen pages of photos, a nugget from history is brought to life!

Collins, llegan a Nueva Delhi para escribir la extraordinaria historia de independencia de la India del Imperio Británico. Éste será el comienzo de una maravillosa historia de amor, desde este primer viaje nace una relación fuerte, intensa y sincera entre la India y el escritor, que desde entonces se dedica por completo a la ayuda humanitaria.Dominique Lapierre viaja desde entonces sin cesar a la India para participar en programas concretos contra lapobreza extrema. La pluma de Dominique Lapierre transporta al lector a un magnífico e inolvidable recorrido por los rincones y misterios de...