Read about several discoveries conducted by Russian scientists in the last 20 years. Match each discovery with the suitable branch of science. There is one extra branch.

Write one letter in each gap.

[ ]

The development of technologies allowed scientists to create light radiation of the highest power. This power is based on the parametric amplification of light that occurs in nonlinear optical crystals. This setup was built at the Institute of Applied Physics of the Russian Academy of Sciences in Nizhny Novgorod.

[ ]

The synthesis of the six heaviest elements of the periodic table was accomplished by scientists from the Flerov Laboratory. It is located at the Joint Institute for Nuclear Research in Dubna near Moscow. These new substances have received official recognition from the International Union of Pure and Applied Chemistry.

[ ]

Russian scientists detected a lake under the ice in Antarctica, which was named Vostok. This lake had been isolated from the rest of the world for approximately one million years. Scientists believe that this discovery will help understand on which planet in the universe life could possibly exist.

A. Chemistry

B. Physics

C. Geography

D. Medicine