Answer: C. a substance changes state from solid to liquid
Explanation:
A physical change is one that occurs when the substance of subject changes its form as a result of a reaction. The most noticeable indicator of this is a change in the state of matter such as a change from liquid to solid like the above.
The other options show a chemical change as the form was not changed but its chemical properties such as color was changed or it lost some atoms which became air.
The correct answer is person's performance
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Hypotheses</u>,<u> dependent</u> and <u>independent variables</u> form a set of tools that help us to create theories about natural phenomena.
The process for investigating a particular phenomenon in nature usually involves three levels. In the first level, observation of facts, phenomena, behaviors and activities takes place; at the second level, we have the hypotheses and finally, at the third level, theories, valid and sustainable hypotheses (those that have been tested) arise.
Dependent Variable are values (phenomena or facts) to be discovered or explained, by virtue of being influenced, determined or affected by the independent variable.
It means the point on the earth's surface directly above or below an exploding nuclear bomb.
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