Arrange the events in the life of a star in the correct order.

all that remains of the star now is the core. in some cases, the star turns into a black hole.

as the nuclear fusion sets off a chain reaction, the nebula gets hotter and brighter and turns into a star.

the star stays in the main sequence stage for a long time.

the star runs out of hydrogen and turns into a planetary nebula or a supernova, depending on its mass.

heavy elements are created when the supernova explodes.

the temperature increases in the center of a nebula, and nuclei begin to fuse.

air quality

poor drinking water

and heavy polution

can lead to poor health

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).