Trenes de Alta Velocidad (Bullet Trains)

If we could take a trip to the center of the Earth, what would we find? In this amazing book readers can do just that with the help of a special ship that can handle the extreme heat and pressure deep beneath Earth’s crust. Digging through a few miles of the crust is just the start of the nearly 4,000-mile journey to Earth’s core. Readers might be surprised to find that not all of the trip is through solid rock, as the intense heat does strange and amazing things to the material that makes up our planet!

This compare-and-contrast text explains the technology we seldom feel we can go without; the phone, computer, and camera. Readers learn the difference between old and new versions of each. New vocabulary such as 'stationary' and 'portable' are introduced. A picture-word glossary is included.

"Una nina humilde, timida y callada llego a convertirse en una gran escritora. Que tan grande? Fue el primer latinoamericano que recibio el Nobel de Literatura, el premio mas importante que se entrega a los autores en todo el mundo! Quieres conocer a Gabriela Mistral? Abre este libro y empieza a leer!"--P. [4] of cover.

Mathematics constitutes ideal material for exercising the art of learning and thinking. For this it is necessary that the classroom has a stimulating atmosphere which requires determined attitudes and beliefs. The book combines theory and practice and responds to questions such as these: to think in the mathematics class? on what does the knowledge of solving problems really consist of? what are the beliefs and which are the most common ones among the students? how to diagnose, evaluate and, in some cases to modify, the systems of beliefs of the pupil?).