¿Por qué hibernan los animales? (Why Animals Hibernate)

Diamonds and salt are both minerals, but diamonds are more rare than salt. Curious readers will learn what physical and chemical conditions must be present for minerals to form. They'll discover how minerals are identified and how they are used in daily life. Informative and interesting text presents readers with this science content in a fun way. A graphic organizer shows how different minerals are identified and fact boxes provide readers with exciting supplementary information.

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.

Una novela negra repleta de acción que retrata la Barcelona más oscura en tiempos de crisis. Ruth Santana es una joven desahuciada y pluriempleada que vive en el umbral de la pobreza para pagar lo que considera su deuda con los bancos. Vive en una ratonera insalubre y desde hace unos meses espera a la salida de los supermercados para coger pan o yogures. Por alguna razón que ni ella misma comprende, sigue luchando. Una noche, un desconocido le hace una oferta. Quiere que le ayude a reventar cajeros automáticos. El hombre le ofrece dinero rápido para pagar su deuda con el banco y volver a ...

Retells Bible stories in simple language, from the genesis of our world to the revelation of a world that is to come.

En estos tiempos tan convulsos en los que la humanidad se encuentra afectada por una pandemia que va aniquilando gran parte de los habitantes del planeta, el doctor Roberto Gutiérrez Laboy reflexiona cuidadosamente, desde la perspectiva de la bioética, sobre cómo enfrentar situaciones tan trágicas como las que se están viviendo. Su finalidad es que se comprenda que las tragedias humanas son parte consustancial de nuestra existencia radicalmente problemática.

Winning the American Revolution was just the first step. After defeating Great Britain, the American colonies were united in name only. How would this independent nation be governed? During the summer of 1787, representatives went to Philadelphia to solve the problem. The result, the U.S. Constitution, created a new government, establishing the foundations of a free nation and setting a new course for history.