Stratus and nimbostratus clouds are usually produced by a (choose...) front.

clouds form

solid ice forms on leaves.

water droplets form on grass.

a 20-cm-long, cylindrical graphite (pure carbon) rod is inserted into an oxidizing atmosphere at 1145 k and 1.013 x 105 pa pressure. the oxidizing process is limited by the diffu- sion of oxygen counterflow to the carbon monoxide that is formed on the cylindrical surface.