Final answer:
The height of the Troposphere in the Northern hemisphere decreases with altitude, due to the decrease in air density and temperature at higher altitudes.
Step-by-step explanation:
When discussing what happens to the height of the Troposphere in the Northern hemisphere, the correct answer is that it decreases with altitude. The height of the troposphere, the lowest layer of Earth's atmosphere, is influenced by temperature, which tends to decrease as altitude increases. At higher altitudes, the air density is lower because the gravitational pull on the air molecules is weaker, and there are fewer air molecules above to compress the air. This relationship is akin to the way air density decreases with altitude, which can be demonstrated graphically by a negative slope on a density-altitude graph. Therefore, as we move up from sea level to the top of the troposphere, we generally find that the height of this atmospheric layer decreases.