Diagnostic medical sonography (DMS) uses. high frequency sound waves to produce images. (sonograms) of structures such as the liver, heart. or unborn baby that can be visualized on a video. monitor. Sonography is often referred to as. âultrasoundâ or âultrasonographyâ. Sonography. can be used to examine many parts of the body. including organs in the abdomen, the breast, the. uterus and ovaries, the prostate gland, the heart. and blood vessels.
principle of superposition - the displacement of any point due to the superposition of wave systems is equal to the sum of the displacements of the individual waves at that point; the principle of superposition is the basis of the wave theory of light. Huygens' principle of superposition.
Words to Know to Interpret the Relative Ages of a Geologic Profile. Law of Superposition states that the rock layer on the bottom is the oldest and the layers get younger as you move up the profile.gneous Intrusions are formed when magma is injected into older rock layers in the crust. Therefore they are younger than the rock they are found in. Look for contact metamorphic rock in the layer above and below the intrusion.