Why when left on the side, can tea not get colder than room temperature

What happens to isotopes that are unstable?

Match the vocabulary terms to their definitions. 1 . a long, chain-like set of molecules made up of repeating units joined end to end polymer 2 . a hard, brittle, heat- and corrosion-resistant material made by subjecting a nonmetallic mineral mixture to intense heat ceramic 3 . a plastic with low elongations that cannot be recycled thermoset 4 . a carbon fiber embedded in a polymer resin matrix thermoplastic 5 . a plastic with high elongations that can be recycled crystal 6 . a solid form resulting from the arrangement of atoms, ions, or molecules in definite geometric patterns composite

Which question comparing two different metals is best answered through science? a. which metal is easier to use? b. which metal is harder to find? c. which metal is less dense? d. which metal is more valuable?