Experimentos con la luz

As a land that’s constantly in flux, Earth sometimes reveals clues about the plants, animals, and other organisms that lived long ago. Fossils teach us much about what life was like millions of years ago, answering the questions of how Earth changed and maybe even why it changed. This essential Earth science topic is thoroughly explained through manageable text, fact boxes, informational charts and diagrams, and a glossary and index. Readers will become young Earth detectives by the time they’re through with this text!

Describes The Physical Characteristics, Behavior, And Metamorphosis Of Insects, And Insects In Your Garden, Backyard And In Your Home.

The asteroid belt between Mars and Jupiter is an intriguing area of our solar system. Scientists have counted over 670,000 known asteroids there, but there could be millions more not yet found. Readers will discover much more about the asteroid belt in this highinterest book, which blends science and math. They'll read about several topics, such as space missions to the asteroid belt and the difference between an asteroid and a planet, and solve associated math problems-just like actual space scientists do!

En este número se analizan los significados e intereses sobre la celebración de los 500 años del descubrimiento de América, desde los dinamismos, mentalidades, estructuras y posiciones institucionales que siguen vigentes. (ITESO), (ITESO, Universidad)