Final answer:
When air converges at high altitudes and descends, it typically results in a high-pressure system with stable weather and clear skies.
Step-by-step explanation:
The student is asking about atmospheric conditions that lead to a specific weather phenomenon. When air converges at high altitudes and then descends to the ground, this often results in a dynamic high-pressure system. The convergence at high altitudes can cause the air to sink due to the increasing density compared to the surrounding air, leading to high pressure at the surface. In a high-pressure system, air moves away from the center of the system when it reaches the ground, leading to generally clear sky conditions and more stable weather, if all other factors are equal.
As altitude increases, the density of air decreases and comparing this to a line graph where air density versus altitude is plotted, results in a decreasing slope, indicating that the air becomes 'thinner' as one climbs higher. A line that gets steeper would represent an increase in slope whereas a line that becomes flatter represents a decrease in slope.