What is necessary for a convection cell to be set up in a fluid? a. thermal gradient b. changes in density c. thermal gradient and changes in density

The option that explains requirements that is needed as regards the setting up a convection cell, using a fluid is : C: thermal gradient and changes in density.

Therefore, option C is correct.

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The correct answer is C) thermal gradient and changes in density

What is necessary for a convection cell to be set up in a fluid is thermal gradient and changes in density.

We are referring to fluid dynamics. A convection cell is present when a fluid is warmed and loses density. When density difference exits within a body of gas or liquid, we are talking about a convection cell. This is a cycle that repeats and it forms a pattern of motion. The blowing of the wind is a by-product of convection cells in the atmosphere.  

john smith was the first englishman to sail around the world. francis bacon served as attorney general and lord chancellor of england. he took up aristotelian ideas, arguing for an empirical, inductive approach, known as the scientific method, which is the foundation of modern scientific inquiry.

either b) they were often feared and despised by other native cultures. or

c) their obsession allowed them to coexist with many other native cultures because of their peaceful nature.