Dec 24, 2025 · Comet, a small body orbiting the Sun with a substantial fraction of its composition made up of volatile ices. Comets are among the most-spectacular objects in the sky, with their …

Jan 2, 2026 · This article covers the structure, composition, and classification of soils and how these factors affect soil’s role in the global ecosystem. In addition, the two most important …

Dec 22, 2025 · Physical mixing in the oceans (thermohaline and wind-driven circulation) tends to homogenize the chemical composition of seawater. The opposing influences of physical …

4 days ago · Observations of the impacts of the fragmented nucleus of Comet Shoemaker-Levy 9 with Jupiter’s atmosphere in 1994 also yielded information about its composition and structure.

The composition of the atmosphere encodes a great deal of information bearing on its origin. Furthermore, the nature and variations of the minor components reveal extensive interactions …

Dec 19, 2025 · The varieties of glass differ widely in chemical composition and in physical qualities. Most varieties, however, have certain qualities in common.

Dec 18, 2025 · Urine, liquid or semisolid solution of metabolic wastes and certain other, often toxic, substances that the excretory organs withdraw from the circulatory fluids and expel from …

5 days ago · LiveScience - The sun: Facts about the bright star at the center of the solar system

Dec 10, 2025 · Two factors control the vertical structure of the lower atmosphere—its composition of almost pure carbon dioxide and its content of large quantities of suspended dust.

Pozzolana, hydraulic cement, perfected by the Romans and still used in some countries, made by grinding a material of volcanic origin with powdered hydrated lime. The material contributed to …