What is the smallest particle of an ionic bond

There is an area in idaho named craters of the moon where most of the ground is covered with basalt, adark gray, igneous rock with no visibl crystals. what can you infer about the geographical history of the area?

If you want to create an electrical current, which situation would produce a solution capable of this

Is the flow of energy during vaporizing more like the flow during melting or during freezing