The volume of the snow decreases. This had happened because the
snow is made up or comprised of water (H2O) and oxygen (O). When the snow starts
melting, the air inside the snow discharges into the atmosphere and the water turn
out to be a puddle on the ground.
Your moms butthole is in my butthole
As you travel up the air pressure decrease, so then the amount of oxygen you use to breathe also decreases