The electromagnetic waves are types of waves which do not require medium for them to pass through to be able to travel from one location to another. The different types of electromagnetic waves therefore vary only in their wavelength and frequency. Thus, the answer is letter B.
Salt is a substance because a substance is a material that has constant composition regardless of its source. Salt is the only option that matches this description
Because the mass is constant, if the velocity is increased, the kinetic energy must also increase.
This statement is false. There is actually five types of plains. The five types of plains are coastal plain, alluvial plain, glacial plain, terrestrial plain and flood plain. Plains are flat areas that are usually located in lowlands and at the bottom of the valleys.