Answer:
changing shape under heat and pressuremelting completely, then cooling
Explanation:
Answer:
A closed system is a physical system that does not allow transfer of matter in or out of the system, though, in different contexts, such as physics, chemistry or engineering, the transfer of energy is or is not allowed.
Explanation:
<span>Their outer shells are filled So much that they don't need to bond or react with any other atoms.</span>