Streams form when downhill running water creates a channel capable of carrying water. Most streams begin as temporary rivulets that only have water after a rainfall.Know More
While a stream is still an intermittent waterway, water flow during and shortly after rainfall creates a small channel in a downhill slope that carries water. With the passage of time and continuous rain events, the stream's channel becomes deeper. When the channel is deep enough, it collects enough groundwater to keep it full between rain events and becomes a permanent stream.
When streams form on opposite sides of a slope, weathering and erosion cause a low area, or saddle, to form. In situations in which one side of the slope is steeper than the other, one stream erodes faster and cuts into the saddle to form a pass. Mountain passes provide a natural route for travel in mountain ranges.
The channels of young streams often have steep sides and rough, steep topography, which leads to waterfalls and rapids. As the stream ages, weathering and erosion smooth the channel, and the stream widens and becomes still. Older streams tend to have wide, gentle curves, or meanders, due to the force of water against the channel walls.Learn more about Landforms
Artesian wells form when water flows through a permeable rock from a higher area to the area of the well. Artesian wells produce water flow without any additional pumping because of the water pressure in the rock, so they require a layer of impermeable rock beneath the permeable rock to block the flow downward. Thus, when a well is dug into the permeable rock, the water flows out under pressure.Full Answer >
The Grand Canyon was formed primarily by erosion from the constant water flow of the Colorado River. This erosion occurred gradually over the past 5 to 6 million years.Full Answer >
A continent is a large land mass on Earth that is distinguished by a separation from other land by water or by a distinct cultural difference. Earth has a total of seven continents: North America, South America, Europe, Africa, Asia, Australia and Antarctica.Full Answer >
The sea is blue because water, in large quantities, is blue. Also, when the light from the sun hits the water, it gets filtered so that redness is absorbed, allowing more of the blue color to be reflected.Full Answer >