As nuvens, or clouds, are visible masses of condensed water vapor floating in the atmosphere. They form when warm air rises, cools, and loses its ability to hold moisture, resulting in tiny water droplets or ice crystals. Nuvens come in various shapes and sizes, categorized into types such as cumulus, stratus, and cirrus. Nuvens play a crucial role in the Earth's weather and climate systems. They help regulate temperature by reflecting sunlight and trapping heat. Additionally, they are essential for the water cycle, as they produce precipitation, which replenishes rivers, lakes, and groundwater.