According to the question, I think that the planes MNR and RNO intersect in a line. In Euclidean Geometry, 2 planes then would intersect precisely in one. Hope this is the answer and would be of help in this question.
the introduction of the variable z means that the graphed functions now represent planes, rather than lines. the substitution method involves solving for one of the variables in one of the equations, and plugging that into the rest of the equations to reduce the system.
The state of the atmosphere at a place and time as regards heat, dryness, sunshine, wind, rain, etc.
The two tectonic plates meet at point one. One is moving under the other, shown by the two arrows on the top pointing towards each other. The denser plate (left side) is subducted. This means the denser plate begins to go under the less dense plate. The lithosphere (crust/tectonic plate) is mainly solid rock. As it begins to go into the mantle it will begin to heat up as the mantle is hotter than the surface. The solid surface becomes a molten rock, known as magma. It melts as it goes down.
TheCrusades were a series of religious wars sanctioned by the Latin Church in the medieval period.