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Plate tectonics is a scientific theory describing the large-scale motion of the plates making up the Earth's lithosphere since tectonic processes began on Earth between 3.3 and 3.5 billion years ago. The model builds on the concept of continental drift, an idea developed during the first decades of the 20th century.
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GULF STREAM
GULF STREAM. A powerful, warm, surface current in the North Atlantic Ocean, east of North America, the Gulf Stream is one of the strongest known currents. It originates in the Gulf of Mexico as the Florida Current, with an approximate temperature of 80 degrees Fahrenheit, a breadth of no more than fifty miles and a depth of a mile or more. It passes through the Straits of Florida and up along the eastern coast of the United States to the Grand Banks of Newfoundland, Canada, driven northward by southwest winds.
As the Gulf Stream reaches Cape Hatteras, North Carolina, the cold Labrador Current that flows from the north separates it from the coast. At this confluence, the warm Gulf Stream waters combine with the cold winds accompanying the Labrador Current, forming one of the densest concentrations of fog in the world. Because of this immense heat transfer, atmospheric storms tend to intensify in this region. Also at this location, the Gulf Stream is split into two currents: the Canary Currents, which are diverted southeast and carry cooler waters to the Iberian Peninsula and northwestern Africa; and the North Atlantic Drift, which flows northwest toward western Europe, providing temperate waters to the western coastal areas of Europe. The water temperature decreases with the northward flow and the breadth of the current spans several hundred miles at its widest. The average speed of the Gulf Stream is four miles per hour, slowing to one mile per hour as the current widens to the north. The Gulf Stream transports as much as 3.99 billion cubic feet of water per second, an amount greater than that carried by all of the world's rivers combined. The current's core, or jet, follows the contours of the
Different populations living together make up a community.
A system or network that allows trade is called a market. An early form of trade, barter, saw the direct exchange of goods and services for other goods and services. Barter involves trading things without the use of money.
