Iwould like to know the definitions of theses words

metal- a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivity

non-metals- an element or substance that is not a metal.

metaloids-  an element properties are intermediate between those of metals and solid nonmetals or semiconductors.

substance- a particular kind of matter with uniform properties.

physical properties- any property that is measurable, whose value describes a state of a physical system

luster- a gentle sheen or soft glow, especially that of a partly reflective surface.

conductivity- the degree to which a specified material conducts electricity, calculated as the ratio of the current density in the material to the electric field that causes the flow of current. It is the reciprocal of the resistivity.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.