The bubbles in ice cubes are there because air that's dissolved in the water comes out of solution as the water gets cold. If the bubbles are surrounded by ice when they form, they get trapped and remain in the ice cube.
Beside this, how do spikes form on ice cubes?
Ice spikes grow as the water in an ice cube tray turns to ice. The ice slowly freezes in from the edges, until just a small hole is left unfrozen in the surface. At the same time, while the surface is freezing, more ice starts to form around the sides of the cube.
Why does my ice cube have a spike?
Water expands when it freezes. As freezing continues, the expanding ice under the surface forces the remaining water up through the hole and it freezes around the edge forming a hollow spike. Eventually, the whole thing freezes and the spike is left.
Why are my ice cube's cloudy?
Water free of minerals and impurities freezes first, and as that water freezes, entrapped air and minerals are moved out of the freezing ice toward the unfrozen center. Eventually the trapped air becomes frozen water with air bubbles which looks like cloudy ice.