jääkourut
Jääkourut, commonly known as icicles in English, are formations of ice that hang from surfaces, typically found in cold climates. They form when water, often from melting snow or ice, drips and freezes incrementally. The process begins with water dripping from a point, such as the edge of a roof or a tree branch. As the water hangs in the air, the surrounding temperature causes it to freeze. Each subsequent drip of water freezes onto the existing ice, gradually building the characteristic conical or spear-like shape.
The size and shape of an icicle depend on various factors including the temperature, the rate of