Las Ciencias Naturales desde un enfoque práctico experimental

Galaxies have a history. This has become clear from recent sky surveys which have shown that distant galaxies, formed early in the life of the Universe, differ from the nearby ones. New observational windows at ultraviolet, infrared and millimetric wavelengths (provided by ROSAT, IRAM, IUE, IRAS, ISO) have revealed that galaxies contain a wealth of components: very hot gas, atomic hydrogen, molecules, dust, dark matter ... A significant advance is expected due to new instruments (VLT, FIRST, XMM) which will allow one to explore the most distant Universe. Three Euroconferences have been...

The scientific accuracy, clarity, and visuals of Chemistry: The Central Science make it the most trusted chemistry book available. A comprehensive media package works in tandem with the text. Translated into Spanish.Introduction: Matter and Measurement, Atoms, Molecules, and Ions, Stoichiometry: Calculations with Chemical Formulas and Equations, Aqueous Reactions and Solution Stoichiometry, Thermochemistry, Electronic Structure of Atoms, Periodic Properties of the Elements, Basic Concepts of Chemical Bonding, Molecular Geometry and Bonding Theories, Gases, Intermolecular Forces, Liquids, and...

The class decides to plant a garden and Miss Frizzle takes them on a zany field trip back to Phoebe's old school where they learn about the cycle of plant life and how living things grow. Original. TV tie-in.

El incremento de productividad en la agricultura de los países desarrollados ha ido unido al empleo de fertilizantes. En ocasiones el empleo excesivo de los mismos no sólo ha aumentado la productividad, sino que se ha convertido en un problema para el medio ambiente. Por otro lado, en los países en vías de desarrollo, la falta de fertilización es una de las causas por las que no se llega a niveles aceptables de abastecimiento alimentario. En la actualidad, se trata de pasar de una agricultura productivista a otra más eficaz, con menor empleo de insumos para reducir los costes de...