An example of a scientific question that could be investigated

Let me try: an example of a scientific question that can be investigated with an experiments is "at what temperature does iron melt"?Questions in physics ans chemistry are easily tested with experiments. an example of a scientific question that cannot be (I think) investigated with an experiments is "how does neuron activaton lead to us having the perception of free will"?Questions connected to human mind on a more general lever are not as easily tested with experiments: they need models rather than this.

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.