What are some rare types of clouds? how are they formed? explain your answer

The Kelvin Helmholtz Waves is one of the rarest clouds. along with the Lenticular Cloud, Fallstreak Hole, Roll Cloud, and Nacreous Cloud.

Explanation: The Kelvin Hemholtz occurs when two different layers of air in our atmosphere are moving at different speeds (a phenomenon known as shear). ... The most obvious example is wind blowing over water, in which fast-moving air can create the waves on the slower-moving water. The lengicular cloud is caused when the air is stable and winds blow across hills and mountains from the same or similar direction at different heights through the troposphere. The nacreous cloud is caused when  the temperature in the stratosphere is below a chilly -78°C, which turns any moisture in the air into super-cooled liquid or ice crystals. ... This light is refracted by the ice crystals in the clouds, a process known as cloud iridescence, producing the shimmering rainbow effect.

answer:

the water molecules are transferred from the roots to the stem or top parts of the tall tree because of important properties of water which are adhesion, cohesion and capillary action. cohesion is the property of water molecules keeps water molecules in a combined state by sharing of bonds between them at the atomic level. adhesion allows the interaction of water molecules with other substances or substrate. adhesion will cause the attachment of water molecules to the wall of the vessel (xylem) of the plant. capillary action occurs when the adhesive force to the vessel wall is stronger than the cohesive force between water molecules. capillary action mimics the transfer of water from a tube or pipe. in this way water utilizes its property to transfer water from down to top level of the plant.