During which step in the can crush lab did water vapor force air from the can? the can was filled nearly to the top with water. the can was placed on the hot stove top burner for several minutes. the can was removed from the hot stove top burner. the can was placed upside-down in the water-filled pan.

The can was placed on the hot stove top burner for several minutes. 

Based on the steps performed in the laboratory, it can be concluded that when applying the thermal dynamic and with the water vapor, a phase change from gaseous to liquid state occurs. The density of liquid water changes drastically. And by heating the can only with air, the molecules are stirred more and the internal pressure increases, so that part of the air leaves until the inner pressure is balanced with the outside (atmospheric). By cooling the can, the air molecules are stirred less strongly and the internal pressure decreases, but not enough so that the atmospheric pressure can crush it, also taking into account that the can is open.

Geographic featured that acted as norther borders of the Roman Empire at its height were: Rhine River, Danube River, Carpathian Mountains, and the Black Sea.