¿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.

The rock cycle has been taking place for millions of years. However, geologists have only known about this phenomenon for about 300 years. Young terrestrial explorers are introduced to different types of rocks, where in the cycle these rocks fit, and where in Earth's layers each step takes place. Fact boxes provide readers with fun additional information. A diagram helps readers make sense of the new information they're learning.

For those who enjoy unconventional solutions, the author offers a wide range of all-time paradoxes that defy your deductive and calculation skills with impossible logical truths, and helps you to learn how to overcome the traps of false truths.

As a teen who may be worried about certain warning signs a friend is exhibiting, it’s important to know how to recognize and confront an eating disorder. After all, teens are the most impacted group for developing eating disorders. Learn how the pressures of school, dating, and athletics contribute to body image issues and why teens are vulnerable. Explore eating disorders that people commonly have and how they are treated. Readers from grades six through twelve will have a relatable text to help them understand how they can make a difference to someone they care about.

Learn how technology has improved lighthouses over time with this book that features a hands-on STEAM challenge and uses real-world examples to give insight into how the engineering design process is used to solve problems.

Toda la información sobre las técnicas tradicionales -y las más actuales- para evitar el embarazo, siempre en forma sistematizada y comprensible. El problema de los embarazos no deseados en las adolescentes es tan común como el lamentable desconocimiento de las formas en que pueden evitarlo; actualmente sólo un tercio de la población aplica de manera constante y consciente los métodos anticonceptivos, y es triste saber que el aborto resulta una práctica común. En estas páginas descubrirás: - Las ventajas y los inconvenientes de la píldora anticonceptiva. - Qué es el anillo...