Why can a star have several different habitable zones

Avoltaic cell converts chemical energy to

Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

Which of the following statement is false ? a.batteries should never be stored on metal trays or outside in the elements)b, battery acid cannot be neutralized)c.do not stack batteries on top of each other)d.never put a damaged battery in a dumpster. i