Causes. Dry skin (xerosis) often has an environmental cause. Certain diseases also can significantly affect your skin. Potential causes of dry skin include: Weather. Skin tends to be driest in winter, when temperatures and humidity levels plummet. But the season may not matter as much if you live in desert regions. Heat.
Brownian movement. n. The random movement of microscopic particles suspended in a liquid or gas, caused by collisions with molecules of the surrounding medium.Also called Brownian motion, molecular movement, pedesis.he random movement of microscopic particles suspended in a liquid or gas, caused by collisions with molecules of the surrounding medium.
The Progressive Movement. The Progressive Movement was an effort to cure many of the ills of American society that had developed during the great spurt of industrial growth in the last quarter of the 19th century. The frontier had been tamed, great cities and businesses developed, and an overseas empire established, but not all citizens shared in the new wealth, prestige, and optimism.