Sum of all forces acting on object is it a forces, unbalanced forces , balanced forces, net forces

The answer is Net Forces.

Net force is the vector sum of forces acting on a particle or body.

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it is unbalanced force

Explanation:

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the answer is false because not all countries have geysers under their crust. for example, iceland uses geothermal energy because it is available every in their country.  

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.