How is solar energy being used as a renewable energy source ? how do nonrenewable resources have an impact on humanity ?

One of the following properties was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version. which property fits this description?

Agas in a balloon at constant pressure has a volume of 160 ml at -125*c. what is its volume at 29.0*c?

Which type of fossil does this image depict?