Question

question 1
what is one reason quartz crystals form flat faces and straight edges?
they are shaped by wind and water over time
they bend easily into smooth shapes as they grow
their atoms are arranged in a repeating pattern
they are made of melted plastic that cooled slowly
question 2
why does rubber not form crystals when it solidifies?
it melts and reforms into sharp - edged shapes
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multiple choice 3 pts
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Explanation:

QUESTION 1

Quartz crystals are minerals with a crystalline structure. The formation of flat faces and straight edges in crystals is due to the regular, repeating arrangement of atoms within the crystal lattice. Weathering (wind/water shaping) affects external form over time but not the internal atomic arrangement that creates the crystal's geometric shape. Bending into smooth shapes or being made of melted plastic (quartz is a mineral, not plastic) are irrelevant. So the correct reason is the atomic arrangement in a repeating pattern.

Rubber is an amorphous material. Crystals require a repeating, ordered atomic arrangement. Rubber's molecules do not form such an arrangement when solidifying. The given option "It melts and reforms into sharp - edged shapes" does not address the lack of crystal formation (as sharp - edged shapes don't mean crystalline structure). But if we follow the answer format:

Answer:

C. Their atoms are arranged in a repeating pattern

QUESTION 2

(Note: The option provided is "It melts and reforms into sharp - edged shapes", but to answer why rubber does not form crystals when it solidifies, we first recall the nature of rubber. Rubber is an amorphous solid. Amorphous solids do not have a regular, repeating atomic structure like crystalline solids. When rubber solidifies, its molecules do not arrange themselves into an ordered lattice structure (which is required for crystal formation). The option "It melts and reforms into sharp - edged shapes" is incorrect for explaining why it doesn't form crystals. A correct explanation would be that rubber has an amorphous structure, and its molecules do not arrange in a repeating pattern during solidification. However, based on the given option (assuming there might be a typo or mis - presentation, but if we have to work with the given option for the answer format):