Which letter on the graph above represents fusion?

The figure here is missing, so we cannot say what is the corresponding letter; however we can describe what nuclear fusion is.

Nuclear fusion is a nuclear process in which light nuclei fuse together into a heavier nucleus. In the reaction, the total mass of the initial nuclei is less than the total mass of the final nucleus, so part of the mass has been converted into energy, according to the equation:

where

is the energy released

c is the speed of light

is the mass defect, which is the mass difference between reactants and products.

Since the factor is very large, we can see that the amount of energy released by a process of nuclear fusion is huge.

An example of nuclear fusion is the fusion of hydrogen nuclei into  helium. This process occurs in the core of the stars, and it is the main process through which stars produce energy. In order to occur, the temperature inside the core must be at the order of several million degrees, because the nuclei must overcome the electrostatic repulsion between them, so that they can come close enough to fuse together: for this reason, nuclear fusion is difficult to achieve on Earth, since it is very challenging to recreate the same conditions of temperature and pressure that we have in the core of the stars.

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).