¿Por qué hibernan los animales? (Why Animals Hibernate)

Although Earth is mostly made up of igneous and metamorphic rock, sedimentary rock covers about 75 percent of Earth's land surface. This means it's the most visible kind of rock on Earth. Sedimentary rocks form when sediment accumulates and compacts. Your readers will learn how sedimentary rocks form, the different types of sedimentary rocks, and how people use sedimentary rocks. Fun fact boxes provide readers with additional information. A helpful diagram illustrates how sedimentary rocks form.

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.

Los Diarios (I -18-10-1939 a 31-07-1949- y II -12-08-1956 a 16-06-1958) de José Lezama Lima, junto a Cartas a Eloísa y otra correspondencia, constituyen los fragmentos más íntimos de su escritura. En ambos se aprecian las dos grandes pasiones del habanero universal: la amistad y el insaciable apetito por la cultura, no para acumular sino como apropiación estimulante para sus muchas y laberínticas ideaciones. Nada le es ajeno: lo inmediato ni lo lejano. Transcurren por las páginas de los Diarios las anotaciones y relumbrones que, más tarde, se transfigurarían en la encarnadura de su...

Examines the nature of inclined planes and wedges, how they can reduce the amount of force necessary to perform work, and ways in which they are used.

In this enthralling, Spanish-translated nonfiction title that features informational text, vivid photos, stimulating facts, and colorful diagrams, readers will learn all about tornadoes and hurricanes--from how they are formed to where are they are most common. This 6-Pack includes six copies of this title and a lesson plan.

A muchos de nosotros nos ha ocurrido alguna vez, creímos que existía otra dimensión además de las que ya conocemos y nos preguntamos si en verdad están ahí o si son meras ilusiones de nuestra frágil mente. Tal vez nunca encontremos una respuesta satisfactoria, tal vez perezcamos antes de averiguarlo, pero al menos sabremos que el mundo real siempre ha sido misterioso y cautivador para muchas personas.