When cold and warm air meet, which rises and which sinks?

Heating up and cooling down, of course. Cold air generally comes from high-latitude continents and ice and snow oceans, while warm air mainly comes from low-latitude warm and humid oceans. Cold air is heavier and often forms a downward airflow. At this time, the air contains less water vapor, which is relatively cold, and generally shows sunny and rainless weather. Warm and humid air generally contains more water vapor, is slower and lighter, and is easy to form updraft.