What is the approximate time of day, based on the position of the Sun in the sky?
A.
sunrise
B.
sunset
C.
noon
D.
midnight

What material does not melt at any temperature

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

Use the periodic table and your knowledge of isotopes to complete these statements. when polonium-210 emits an alpha particle, the child isotope has an atomic mass of 1-131 undergoes beta-minus decay. the chemical symbol for the new element is fluorine-18 undergoes beta-plus decay. the child isotope has an atomic mass of done intro donne