Which layer of the atmosphere has the highest density of gas
molecules? Why?

Which layer of the atmosphere has the highest density of gas molecules? Exosphere.

Explanation:

The density of the exosphere is just a fraction of at sea level. And its mass is only 0.002% of the total mass of the atmosphere because gas molecules are far apart in the exosphere. Sound waves can't travel through this layer of the atmosphere. If your body interacted with the exosphere, it would be freezing cold

what are the choices for the anwser?

a mid-ocean ridge or mid-oceanic ridge is an underwater mountain range, formed by plate tectonics. this uplifting of the ocean floor occurs when convection currents rise in the mantle beneath the oceanic crust and create magma where two tectonic plates meet at a divergent boundary.a geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged.