La compra de Luisiana (The Louisiana Purchase)

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.

¡Hola, hijo de Newton! ¿Así que quieres crear una máquina para teletransportarte e un segundo a Hawái? ¿Y a veces piensas hacer un pequeño Big Bang para tener un universo a tu disposición? ¿O incluso en ocasiones viajar cinco minutos al pasado para seguir durmiendo y no tener que despertar para ir a clase? De la mano de Javier Santaolalla, doctor en física, investigador del CERN y Youtuber, descubrirás cómo lograrlo. En este libro encontrarás un montón de información que hará que tu cerebro explote. Así que ¡ve con cuidado! ¿Listo para que te estalle el cerebro?

If you lived long ago, how different would life be from how it is today? Many things are different, but many things are the same! Introduce students to the concept of change as they compare homes, schools, jobs, technology, and transportation from the past and present. This primary source book uses dynamic primary source images and supportive text to integrate social studies content and language arts instruction. The accessible table of contents, glossary, and index work to aid students in better understanding the content. Aligned to state and national standards, this Spanish book will engage ...

¡Conoce al iguanodon, un dinosaurio herbívoro que pesaba toneladas literalmente! Las imágenes coloridas ayudan a los lectores a aprender cómo era la vida para estos comedores de plantas de punta. Meet the iguanodon, an herbivore dinosaur who weighed tons—literally! Now in Spanish, carefully leveled text and colorful images help readers learn what life was like for these spiky-thumbed plant-eaters.