How Do You Measure Time?

Provides an overview of the design, uses, weapons, and equipment of U.S. Navy submarines. Written in English and Spanish.

For young people, it can be easy to confuse what one wants as opposed to what one actually needs. This thoughtful resource elucidates the basic concepts of wants and needs and how they fit into the economic landscape. Readers will be asked to consider the different priorities of cultures from around the world, offering a more global overview, as well as a perspective on what people needed in the past. The text nudges the idea of needs further with a discussion of emotional needs and what those might be.

[English] What is the difference between a savanna and a prairie? How do bison, zebras, and other grazers avoid hungry grassland predators? Trek across the plant-covered landscape of this book, and find out what makes grasslands one of Earth's treasures. [Spanish] ¿Qué diferencia hay entre una sabana y una pradera? ¿Cómo escapan los bisontes y las cebras de los depredadores? Camina entre los altos pastos de este libro. Descubrirás por qué los pastizales son uno de los grandes tesoros de la Tierra.

The Earth is a remarkable place! In the universe, Earth is the only place that we know for sure has life and non-life. Learn all about interdependence in ecosystems with this Spanish science reader that brings the power of science and informational text to students at a level they can understand. Introduce students to STEM topics and new vocabulary terms like oxygen cycle, stimuli, homeostasis, and micro-organism with this nonfiction book that is aligned to state and national standards. The leveled text supports students reading at above-, below-, and on-grade level. The fun lab activity...

Esta guía visual ayuda a comprender los comienzos del universo y del sistema solar, el inicio de las diversas formas de vida en nuestro planeta, el origen africano de los seres humanos y su desplazamiento por los continentes. Un libro que nos descubre nuestra historia en la Tierra y nos explica por qué todos somos parientes.