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Paintings of Diego Velázquez, Spanish artist of the Baroque period, were recreated by several twentieth century painters, including Pablo Picasso and Salvador Dali, in their own style (read more)

Featured Article: Groundwater

Groundwater is located within the zone of saturation
Groundwater or ground water is water located within the ground's zone of saturation, where the soil pore spaces and fractures in the rock are completely filled with water. It differs from soil water, which is the water that is in the unsaturated zone, or zone of aeration, where the soil pore spaces contain air and water but are not completely saturated.

The depth at which soil pore spaces or fractures and voids in rock become completely saturated with water is called the water table; in other words, below the level of the water table the soil pores and rock fractures are saturated with water. An aquifer is a layer within the zone of saturation that can readily yield and store water, such as in interconnected spaces (fractures, cracks, poor spaces, etc.) that can provide a source of water for a well.

Popular Article: British Empire

The British Empire in 1897
The British Empire is the most extensive empire in world history and for a time was the foremost global power. It was a product of the European age of discovery, which began with the global maritime explorations of Portugal and Spain in the late fifteenth century. The British Empire was, at one time, referred to as "the empire on which the sun never sets" because the empire's span across the globe ensured that the sun was always shining on at least one of its numerous colonies.

By 1921, the British Empire ruled a population of between 470 and 570 million people, approximately one-quarter of the world's population. It covered about 14.3 million square miles (more than 37 million square kilometers), about a quarter of Earth's total land area. Though it has now mostly evolved into the Commonwealth of Nations, British influence remains strong throughout the world: in economic practice, legal and governmental systems, sports (such as cricket and football), and the English language itself.