Fixed Bridges or Moveable Bridges
The two ways are: Heterogeneous Homogeneous
Two ways are by temperature and brightness
elevation and shape
Public and Private
spectrum and temperature
It is both a vascular and living organism.
Americans used steel to build bridges and skscapers.
See the link below for details about clouds classification.
How are elements classified
Bridges are classified by 3 criteria: material, structure, and construction method. Materials include steel, reinforced concrete, and stone. Bridge structures often seen range from cable suspension bridges to simple arch bridges. Bridges built with the cantilever effect are usually suspension bridges, and are supported only on one side until completion, whereas bridges built via the incremental launch method are built pieces at a time, with regular supports to the ground at each segment.
What are some ways the stars in the photo could be grouped or classified
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.