Why does fossil fuel use in the united states make the u. s. vulnerable to the political wishes of foreign countries?
a. the us is a net exporter of fossil fuels.
b. fossil fuels lead to global climate change.
c. the us imports much of its petroleum from foreign countries which set the prices.
d. all of the above.

The US imports much of its petroleum from foreign countries which set the prices.

Explanation:

The United States is one if the largest customers of many oil producing countries like Kuwait, Nigeria, Qatar etc. Usually, these countries set the oil price, being dependent on these countries for energy supply in the area of fossil fuels makes the United States quite vulnerable to the political wishes of these countries since energy is Paramount for development in this modern day and age.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

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