Which is shown, an altitude, a median, or neither?

is shown.

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

stratosphere: as the altitude increases, the air temperature increases. the stratosphere has a layer of ozone, called the ozone layer. this layer absorbs most of the ultraviolet radiation from sunlight. this results in the stratosphere being warmer.

answer; both surfaces of the membrane are nonpermeable