How does convection transfer ...

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How does convection transfer heat?

Question 2

Radiocarbon dating is possible primarily because ____.
 A)the ratio of carbon-14 to carbon-12 in the atmosphere is constant
 B)carbon-14 is constantly being formed in the upper atmosphere
 C)living organisms selectively use carbon-13 and carbon-12
 D)organisms stop accumulating carbon-14 when they die
 E)carbon 14 decays to oxygen

[parshano]

Answer to Question 1

As a material is heated, it expands and its density decreases. The less dense material then rises. After rising some distance, the material begins to cool, contract, and become denser. The material sinks and returns to the original level where it will eventually be heated and rise again.

Answer to Question 2

D