From What I got I dont really know but if you got the work sheet key terms I would go with elements
Topaz is the mineral that defines 7 on the Mohs scale.
The mineral commonly used for melting ice on slippery winter surfaces is rock salt, also known as sodium chloride. It lowers the freezing point of water and helps to break down the ice, making it easier to clear the surface.
The temperature at which a solid melts is called the melting point. At this temperature, the solid transitions into a liquid state.
because amorphous solids are that solids that don't have geometrical shape and don't have particular melting point but crystalline solids have characterstic geometrical shape and have sharp melting point.
All the silicates are molten at about 1200°C and all are solid when cooled to about 600°C.
metamorphism
The mineral with the highest known melting point is tungsten, which has a melting point of 3,422 degrees Celsius.
A rocks melting point at surface pressures would depend on its mineral composition. Every mineral has a different melting point, and rocks are composed of a variety of minerals.
Water can lower the melting temperature of a mineral by acting as a flux or catalyzing agent, allowing atoms to move more freely and reducing the energy required for melting. This can lead to the formation of new minerals or phases at lower temperatures than would occur without water present.
Topaz is the mineral that defines 7 on the Mohs scale.
A mineral is defined as a naturally occurring crystalline inorganic solid with a regular, ordered structure. Ice meets all those criteria, so it is a mineral. Ice is just as much a mineral as, say, quartz. The only difference is that the melting temperature of ice is very low, but melting temperature doesn't have anything to do with whether or not something is a mineral.
melting
The mineral commonly used for melting ice on slippery winter surfaces is rock salt, also known as sodium chloride. It lowers the freezing point of water and helps to break down the ice, making it easier to clear the surface.
Diamond is the hardest natural mineral on earth. That this mineral has the highest melting point of any mineral -- 3820 degrees Kelvin -- is logical. You can read more about this mineral, below.
The temperature at which a solid melts is called the melting point. At this temperature, the solid transitions into a liquid state.
because amorphous solids are that solids that don't have geometrical shape and don't have particular melting point but crystalline solids have characterstic geometrical shape and have sharp melting point.
Amorphous means not having a distinctive shape or formless. It is no particular mineral or element there for can have no particular melting point.