Método de los relojes

En este volumen, aprenderás a diferenciar las principales especies de lagartos, un reptil que vive en hábitats muy variados y que tienen costumbres tan curiosas domo la del camaleón de cambiar el color de su piel para adaptarlo al color del entorno. Conocerás también a lagartos de tamaños tan dispares como el varano gigante, de más de tres metros de longitud, y el geco, que apenas alcanza los diez centímetros y descubirás que los lagartos se deshacen de una parte de la cola para engañar a sus enemigos.

Invites young readers to learn to count in English and Spanish as they search for the right place to put the reusable stickers.

What is matter and where can it be found? Everything in the world is made of matter, whether it is a solid, a liquid, or a gas. Important ideas about matter such as volume, mass, and how matter changes state are conveyed through a series of easy-to-do experiments.

Five and counting! So far, astronomers have discovered five dwarf planets in our solar system. Pluto, which was once thought of as the ninth planet, is today classified as a dwarf planet. This book looks at the current dwarf planets, characteristics, size, and orbital patterns, as well as the three rules scientists follow to characterize these tiny, round space objects. Every day new discoveries are being made. Who knows how many dwarf planets we will find in the future! This book will allow students to understand that patterns in the natural world can be observed, used to describe phenomena, ...