Which of the following readings is used to determine the availability of minerals? a. radioactivity b. magnetism c. gravity d. all of the above

All of the above readings are used to determine the availability of minerals.

A mineral is a naturally occurring substance, representable by a chemical formula, that is usually solid and inorganic, and has a crystal structure. It is different from a rock, which can be an aggregate of minerals or non-minerals and does not have a specific chemical composition.

The correct answer between all the choices given is the last choice or letter D. I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

take a better picture and ill do it

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)