Rivers originate from forms of precipitation, springs, groundwater recharge or melted ice and snow gathering at the top of a mountain or hill. This trickling of water starts as a gully, then converges with tributary streams to form a river. A river is then formed by its flowing motion cutting through the surface to allow it to flow.Know More
Gullies gain strength as they merge with several tributary streams along the higher points of elevated surfaces. As the river travels down these hills or mountains, they form depressions called valleys. The river continues to flow downstream, gathering pieces of rock and breaking them down with its flowing movement. Once the stream reaches flatter ground, the broken down pieces of sediment solidify the makeup of the river by depositing themselves to the bottom. The river continues to flow, but at a slower pace in the shape of an S called a meander.
Most rivers form on the surface, but they can also form underground. These types of rivers are called subterranean and subglacial streams. Subterranean rivers are caused by rivers flowing through sinkholes in mountains and flowing through the caves, while subglacial streams are created from melted water and flow under sheets of ice and glaciers.Learn more about Earth Science
The densest material on earth was created by the Large Hadron Collider and named quark-gluon plasma. The substance can only exist in extremely hot temperatures and is denser than a neutron star.Full Answer >
Wind is created by changes in air pressure from one area to another. Changes in air pressure are determined by a variety of forces, including the density and temperature of air masses. When air moves from between areas of high pressure and low pressure, wind directions and speeds may change.Full Answer >
Wind energy is created when moving air causes a wind turbine to rotate, powering a motor that generates electricity. The energy of the wind itself derives from differential heating of the air by the sun and the rotation of the Earth, combined with landscape features which shape the air flow. In this way, wind power is an indirect form of solar power.Full Answer >
A lightning bolt is created from the ground up and also down from the sky. Negative charges from a thunderstorm slowly lower to the ground, while positive charges rise from the ground or an object toward the sky. When these two streamers, or ion groups, meet, visible lightning is created.Full Answer >