The correct option is: A STRONG WIND BLOW ACROSS A MIDWESTERN PRAIRIE.
This sentence describes energy flow between two natural elements. The strong wind is natural and the prairie is natural.
But the other sentences involved artificial systems which had been set up by man. A turbine is a machine that is used to generate energy from wind; it is an artificial system created by man.
Answer:
The Schwarzschild radius (sometimes historically referred to as the gravitational radius) is a physical parameter that shows up in the Schwarzschild solution to Einstein's field equations, corresponding to the radius defining the event horizon of a Schwarzschild black hole
Explanation:
The Schwarzschild radius define the “size” of a black hole. Theorists believe that all the “stuff” inside a black hole collapses into a singularity, an infinitely small and infinitely dense point well inside the boundary defined by the Schwarzschild radius.
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Erosion creates sand dunes, beaches, and deltas. The process of erosion either by chemical or physical means causes the formation of many types of land forms like the one mentioned a while ago. Without erosion the life cycle of Earth will not be a continuous one and many organisms will not survive.