Arizona, el Estado del Gran Cañon

Imagine traveling at half the speed of a jet plane without ever leaving the ground! Students will discover the technology that makes such speeds possible, from special tracks and safety precautions to aerodynamically designed trains. What are the limits to the speed of trains? What imposes those limits? Students also will read about the future of passenger train travel, from flying trains to trains that use huge magnets to levitate inches or centimeters off the track. Some trains safely reach speeds of more than 200 mph!

Este libro intenta hacer entender a los niños cómo funciona su cuerpo, por dentro y por fuera. Contiene doce pequeños libros sobre diferentes partes del cuerpo: el cerebro, los huesos, la nariz, el oído... Además, en el interior se incluye un espejo con el que el niño podrá observarse.

Can you find what is round? What is square? In this bilingual English / Spanish edition from Eric Carle, creator of The Very Hungry Caterpillar, children can find the bottom half of a page that matches the top half. Find the right pairs, and you will learn to identify all kinds of shapes. From dome-shaped ladybugs to diamond-shaped kites, this clever board book makes learning fun.

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.