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The name of that mineral-rich silt is loess. In fact, this extensive Chinese river is called Huang ("Yellow") due to the great amounts of fine loess deposits that it carries to the Bohai Sea and that turn the water that color. It is not infrequent that, as a result of these thick loess sediments, the course of the river changes, and that the bed of the river is so elevated as to cause devastating, and often deadly, floods.
Free market is run by the firms and households mainly. They control where resources are allocated, to which products production. There is minimal or no government intervention in the Free market economy. All the government can really do is policing, maximum.
Social market economy is like a combination of planned economy and free market economy, run by all three: households, firms and the government. The government has more power in this, it can do more things, it has more control. There is more government intervention in this economy than in a free market economy.
Accomplishments of the National Association for the Advancement of Colored People (NAACP) range from helping establish reform to building strong communities. The group helped promote civil rights and played a part in ending segregation.