An air mass forms when air stays over an area for a while or moves slowly true or false

An air mass forms when air stays over an area for a while or moves slowly. Air masses that form over over land are moist. Air masses that form over tropical regions are warm. Polar air masses that form over warm regions.

Explanation:

True, an air mass is a cluster of air that is uniform in temperature and humidity

Explanation:

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.

united states government;