Dependent variable: amount of dandelions killed by werd
Independent variable: health of dandelions/where they grew (if one is malnourished/older/dry it might be killed by the weed killer with more ease)
Answer:
The easiest way to determine if a 1943 cent is made of steel, and not copper, is to use a magnet. If it sticks to the magnet, it is not copper. If it does not stick, the coin might be of copper and should be authenticated by an expert
Explanation:
Googles Definition of Convection: <span>the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.
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