elevation and shape
See the link below for details about clouds classification.
Clouds are classified based on their appearance and height in the atmosphere. Appearance classifications include stratus (layered clouds), cumulus (puffy clouds), and cirrus (wispy clouds). Height classifications are categorized as low-level, mid-level, and high-level clouds depending on the altitude they form at.
See the link below for details about clouds classification.
The two ways are: Heterogeneous Homogeneous
Two ways are by temperature and brightness
Public and Private
spectrum and temperature
Fixed Bridges or Moveable Bridges
It is both a vascular and living organism.
Spain and Portugal
Waves can be classified as mechanical or electromagnetic based on how they travel through a medium. They can also be classified as transverse or longitudinal based on the direction of oscillation compared to the direction of wave propagation.
They can be classed as terrestrial planets or gas giants, or inner and outer.