Are two atoms of the same element identical??​

Which is the layer underground where all empty spaces are filled with a combination of air and water ?

Which of the following is not a good technique for managing used oil? a) have specific, labeled catch pans available for technicians who are collecting oil b) spills in your shop and any releases on pavement or outside should be poured down a drain c) do not use oil containers for antifreeze or other non-similar fluids d) be prepared for oil spills with the proper absorbents

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass