A contour line<span> or isoline </span>connects points<span> on a map that are of </span>equal<span> value. Examples of contour </span>lines<span> or isolines are isobars (pressure) and isotherms (</span>temperature<span>). Perhaps the prototypical example of a contour </span>line<span> is that which </span>connects points of equal<span> elevation (that is, height above sea level).</span>
Schist has the highest metamorphic grade.
According to the theory, the Earth's crust is made up of continental and oceanic plates, which move across the surface of the planet, meeting at plate boundaries. Plate tectonics cause volcanic activity, mountain-building, ocean trench formation and earthquakes.
Answer:
The plates are moving and have been for billions of years... they collide and they rip apart. ... The plates carry the continents on their "backs"; if two plates -each with a continent- collide, then a supercontinent can be created.
Explanation: hope this helps
