Helium is mixed with oxygen gas for deep sea divers. calculate the percent by volume of oxygen gas in the mixture if the differ has to submerge

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

Put these processes of the water cycle in the correct order, starting at the point where the water is in the lake: 1. water evaporates into the atmosphere 2. rain, snow, or other precipitation falls 3. water collects into larger bodies of water 4. water vapor condenses into liquid water

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.