4. regional metamorphism
p.s. not sure if those answers are all correct.
Vectors are usually described in terms of their components in a coordinate system. Even in everyday life we naturally invoke the concept of orthogonal projections in a rectangular coordinate system. For example, if you ask someone for directions to a particular location, you will more likely be told to go 40 km east and 30 km north than 50 km in the direction
north of east.
In a rectangular (Cartesian) xy-coordinate system in a plane, a point in a plane is described by a pair of coordinates (x, y). In a similar fashion, a vector
in a plane is described by a pair of its vector coordinates. The x-coordinate of vector
is called its x-component and the y-coordinate of vector
is called its y-component. The vector x-component is a vector denoted by
. The vector y-component is a vector denoted by
. In the Cartesian system, the x and y vector components of a vector are the orthogonal projections of this vector onto the x– and y-axes, respectively. In this way, following the parallelogram rule for vector addition, each vector on a Cartesian plane can be expressed as the vector sum of its vector components.
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