Hacia un mundo verde

Provides The History Of Biofuels, Different Uses, Positive And Negative Characteristics, And How They Will Impact The Future.

Explains The Early History Of How The Bill Of Rights Came To Be And How It Is Used To Protect Citizens.

Elementary readers will get a look into space exploration as they move through this fascinating nonfiction title that has been translated into Spanish. Readers will discover galaxies like the Milky Way, the effect gravity has on the inner and outer planets, comets, asteroids, constellations, and what measures scientists are taking to learn more about the vast body of the universe and more, including the Hubble Telescope and the Mars Rover. With vivid images, intriguing facts, informational text, a glossary, and a list of helpful websites, this text encourages readers to discover what they...

"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...

En este cuaderno se estudian algunas de las reglas más usuales de la acentuación y la puntuación. A la acentuación se dedicará más adelante el cuaderno 17, y a la puntuación, el 18. Se estudian también algunas palabras de uso frecuente que contienen las letras b, v y h.