Why do some readers choose to join reader groups? (5 points) groups offer opportunities to discuss interesting topics in literature. groups allow readers to find out the ends of stories without reading. groups usually give away free books to their regular attendees. groups can prove to the community that you are a true "reader."

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).