Exploremos el ciclo de la roca (Exploring the Rock Cycle)

Hamburg, 1947, a headless body is found in the ruins of a bombed out building. No evidence or identifying clues are left behind. Inspector Frank Stave, a man traumatized by the war, does not have high hopes of solving this case. When another victim is located, Stave knows he has a serial killer on his hands. The investigation that he launches puts his personal safety at risk.

A giant, spinning storm forms over the ocean. People living on the coast start to flee inland for safety. Once the storm makes landfall, heavy rains and fast-moving winds knock down trees and destroy homes. In this captivating introduction to hurricanes, early readers will be swept up in the dramatic text that describes the first signs of a hurricane, its destructive power, and, most importantly, how to stay safe from a hurricane’s devastating winds and rains. Each 24-page book features controlled text with age-appropriate vocabulary and simple sentence construction. Stunning photos closely ...

Learn the history of number systems with this engaging Spanish book! This text combines mathematics and literacy skills, and uses practical, real-world examples of problem solving to teach math and language arts content. Students will learn place value while reading about the number systems of the Egyptians and Romans, and also learn important vocabulary terms like cuneiform, binary systems, roman numerals, and more! The full-color images, math charts, and practice problems make learning math easy and fun. The table of contents, glossary, and index will further understanding of math and...

"Some things are so huge or so old that it's hard to wrap your mind around them. But what if we took these big, hard-to-imagine objects and events and compared them to things we can see, feel and touch? Instantly, we'd see our world in a whole new way." So begins this endlessly intriguing guide to better understanding all those really big ideas and numbers children come across on a regular basis. Author David J. Smith has found clever devices to scale down everything from time lines (the history of Earth compressed into one year), to quantities (all the wealth in the world divided into one...