Students are studying a mineral. they observe that the mineral can be scratched by glass and a streak plate. however, the mineral cannot be scratched by an iron nail or copper penny. According to the hardness scale above, which mineral are the students most likely testing? A. Apatite
B. Topaz
C. Feldspar
D. Fluorite
(PLEASE PLEASE HELP)

chemical because it warmed up which involves temperature and it bubbled which includes changing

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.