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Videos de Conceptos Relacionados

Classifying Matter by Composition03:35

Classifying Matter by Composition

Matter: Pure Substances and Mixtures
According to its composition, the matter can be classified into two broad categories — pure substances and mixtures. 
A pure substance is a form of matter that has a constant composition throughout with uniform properties. For example, any sample of sucrose has the same composition and same physical properties, such as melting point, color, and sweetness, regardless of the source from which it is isolated. 
A mixture is composed of two or more types of...
The Soil Ecosystem02:23

The Soil Ecosystem

Plants obtain inorganic minerals and water from the soil, which acts as a natural medium for land plants. The composition and quality of soil depend not only on the chemical constituents but also on the presence of living organisms. In general, soils contain three major components:
What is Matter?01:13

What is Matter?

The substance of the universe—from a grain of sand to a star—is called matter. Scientists define matter as anything that occupies space and has mass. An object’s mass and its weight are related concepts, but not quite the same. An object’s mass is the amount of matter contained in the object and is the same whether that object is on Earth or in the zero-gravity environment of outer space. An object’s weight, on the other hand, is its mass as affected by the pull of gravity. Where gravity...
Conditions on Early Earth02:06

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
Conditions on Early Earth02:06

Conditions on Early Earth

Around 4 billion years ago, oceans began to condense on earth while volcanic eruptions released nitrogen, carbon dioxide, methane, ammonia, and hydrogen into the primordial atmosphere. However, organisms with the characteristics of life were not initially present on earth. Scientists have used experimentation to determine how organisms evolved that could grow, reproduce, and maintain an internal environment.
What are Biogeochemical Cycles?00:54

What are Biogeochemical Cycles?

The most common elements in organic molecules, carbon, hydrogen, oxygen, nitrogen, sulfur, and phosphorus, are only available in the ecosystem in limited amounts. Therefore, these nutrients must be recycled through both biotic and abiotic components of the ecosystem, in processes generally called biogeochemical cycles.

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Video Experimental Relacionado

Updated: Jul 12, 2026

Simulation of the Planetary Interior Differentiation Processes in the Laboratory
06:04

Simulation of the Planetary Interior Differentiation Processes in the Laboratory

Published on: November 15, 2013

La composición de la Tierra.

D L Anderson

    Science (New York, N.Y.)
    |January 20, 1989
    PubMed
    Resumen

    Nuevas estimaciones de la composición solar revelan niveles más altos de hierro y calcio, lo que afecta a los modelos de abundancia cósmica. Esto sugiere una composición de manto más densa y con zonas químicas para los cuerpos del sistema solar interior.

    Área de la Ciencia:

    • Ciencias planetarias Ciencias planetarias.
    • Cosmoquímica es la cosmoquímica.
    • La geofísica es la geofísica.

    Sus antecedentes:

    • Los modelos anteriores de abundancia cósmica y composición nebulosa se basaban en valores condríticos.
    • Las estimaciones de la composición solar se han actualizado con nuevas mediciones.

    Objetivo del estudio:

    • Revisar los modelos de abundancia cósmica basados en nuevos datos de composición solar.
    • Para inferir la composición química y la estructura de los mantos planetarios.

    Principales métodos:

    • Análisis de nuevas estimaciones de la composición solar.
    • Comparación de las nuevas estimaciones con los valores condríticos.
    • Interpretación de datos geofísicos.

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    Principales resultados:

    • La nueva composición solar muestra un enriquecimiento en Fe y Ca en relación con Mg, Al y Si.
    • Las relaciones atómicas de Fe/Si y Ca/Al son un 30-40% más altas que los valores condríticos.
    • La composición implícita del manto incluye ~15 wt% FeO y más CaMgSi2O6 (diopside).

    Conclusiones:

    • Es necesario revisar las abundancias cósmicas y la composición nebulosa.
    • Los datos geofísicos apoyan un manto inferior denso y rico en FeO y una región de transición rica en diopside.
    • Los resultados favorecen un manto químicamente zonado con un contenido de FeO típico de los cuerpos del sistema solar interior.