What type of reaction does this diagram below represent?

Nuclear fusion

Explanation:

The reaction shown in the diagram depicts a nuclear fusion.

 The reaction expression is given as:

        ²₁H   +   ³₁H     →     ⁴₂He   +   ¹₀n  + energy

This reaction is a nuclear fusion expression. Here two small lighter nuclide to form a product with an attendant emission of a neutron and energy.

The combination of lighter nuclides to form a heavier one is nuclear fusion.

Fusion is different from nuclear fission in which a heavier nuclide splits up.

Methods of controlling the weather such as seeding clouds to create rain is not a good idea because interfering in the natural phenomena always have bad affects in the long run. Cloud seeding can have negative effect. It can harm plants and animals and also it can pollute the atmosphere. Cloud seeding can affect the natural weather and natural rain.

It has some advantages also it is helpful in providing rain in the drought area.

Cloud seeding with Silver iodide is useful to clear super cooled fog on roads or railway track or  airport.