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The correct matches of the terms to the description would be as follows:

A. solar nebula 
large cloud of gas and dust

B. accretion disk 
gas and dust spins

C. solar system 
planets orbit a star

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A- Solar nebula - large cloud of gas and dust

The solar system started forming withing an interstellar dust and a molecular cloud made up of hydrogen gas. This molecular cloud contracted and formed a swirling disc like structure, known as solar nebula.

B- Accretion disc- gas and dust spins.

An accretion disk is a cloud formed by dust and gas spinning around a central body. the central body is typically made up of a star. The in ward spinning of the gas and dust is caused by the friction.

C- Solar system - planets orbit n star.

The solar system is a group of celestial bodies, planet, their satellite and a star in the centre. In the solar system, the star is the sun and the other planets revolve the sun.