The mineral fluorite is commonly sold in mineral shops as octahedral (8-sided) objects. this shape originates from
a) a pseudomorph (false form) of fluorite from replacement of a salt, potassium chlorite, that grows in octahedral crystals.
b) the growth of fluorite in caves and is the form the crystals grow in the open cavern.
c) the typical crystal form of fluorite.
d) cutting a larger crystal along four perfect cleavage planes, forming a cleavage fragment.

d) cutting a larger crystal along four perfect cleavage planes, forming a cleavage fragment.

Explanation:

Fluorite Octahedron crystals are formed narutally, but it's not common, they can be found more commonly as cubes, the majority of fluorite octahedron are formed when miners cit them along its natural cleave lines.

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temperatures get warmer — and heatwaves are more common. nothing says summer like warm weather. this rise in temperatures is caused by the tilt of the earth's axis. our planet doesn't sit perfectly straight as it spins — it has a slight lean of approximately 23.5 degrees with respect to the sun, called the axial tilt.

explanation: