The sign: Foamy or bubbly urine. What it means: You could have kidney disease. When your kidneyâs filtering units arenât working properly, that can lead to a build-up of protein in your urine. The protein then creates a foamy appearance when it hits the water in the toilet.
This gives us a point in the x1-x2 or phase plane that we can plot. Doing this for many values of t will then give us a sketch of what the solution will be doing in the phase plane. A sketch of a particular solution in the phase plane is called the trajectory of the solution.
A fault plane is the plane that represents the fracture surface of a fault. A fault trace or fault line is the intersection of a fault plane with the ground surface. A fault trace is also the line commonly plotted on geologic maps to represent a fault.