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 was a turn-of-the-century political movement interested in furthering social and political reform, curbing political corruption caused by political machines, and limiting the political influence of large corporations.any Progressives, including U.S. President Theodore Roosevelt, saw no conflict between imperialism and reform at home-to them, both were forms of uplift, reform and improvement, and so they saw in these new colonies an opportunity to further the Progressive agenda around the world.