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Explain some of Anaxagoras teachings and theories on science?

He believed the moon & sun were firey stones & he believed air was gas.

One theory was that he  proposed that the universe was made up of a substance that could be divided infinitely

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.