Snow is a form of precipitation that occurs when water vapor in the atmosphere freezes into ice crystals. These crystals cluster together to form snowflakes, which fall to the ground when they become heavy enough. Snow can accumulate on the ground, creating a white blanket that can affect travel and outdoor activities. Ice is the solid state of water, formed when temperatures drop below freezing. It can appear in various forms, such as frost on surfaces, icicles hanging from roofs, or frozen lakes and rivers. Both snow and ice play important roles in the Earth's climate and ecosystems, influencing weather patterns and providing habitats for wildlife.