Is movement in a fluid, caused when part of the fluid (whether gas or liquid) is heated. the heated portion expands and becomes less dense, rising up through the cooler portion.

Your answer would be "Convection"

Convection is movement in a fluid, caused when part of the fluid (whether gas or liquid) is heated. the heated portion expands and becomes less dense, rising up through the cooler portion.

Definition:

Convection:

The definition of convection is in the section above.

Explanation:

The reason why "Convection" would be the correct answer is because it is the correct word for the definition in the question. Convection is when there is heat that's transferring due to molecules moving around in a fluid, this could be things like gas, liquid, and molten rocks. An everyday item that causes a convection are things like tea kettles, air conditioning units, and etc. This is a very common thing that no one really things about.

Why the other answer choices are incorrect:

The answer choice "Convention" is incorrect because:

Convention is when heat is transferred, and this occurs only in gases and liquids. When there is a difference in the temperature between a liquid or gas, the hot part of the molecules rise, while the colder molecules sink to the bottom. This does not fit the definition that's in the question. This is the reason why this answer choice would be eliminated.

The answer choice "Advection" is incorrect because:

Advection is when heat is transferred horizontally, or up, into the atmosphere, meaning that the heat is going up to the sky. This happens because of bulk motions. This also does not fit the definition in the question. This is the reason why this answer choice would be eliminated.

The answer choice "Conduction" is incorrect because:

Conduction is when heat or electricity is transmitted to a substance where there is a different temperature. The definition that was provided in the question does not mention anything about electricity, so this answer choice would be eliminated because of that. This is the reason why this answer choice would be eliminated.

The answer choice "Radiation" is incorrect because:

Radiation is when energy is moving as a subatomic particle electromagnetic waves. This mostly is caused by high-energy particles, which causes ionization. This does not fit the definition that was said in the question, so this answer choice would be eliminated. This is the reason why this answer choice would be eliminated.

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