Answer:
a. True
Step-by-step explanation:
A type of relief that is characterized by its height and its flat character is called a plateau. Indeed, a plateau is a plain that has a height greater than four hundred meters above sea level. This type of formation can be found in every corner of the world and is the result of different phenomena coexisting and acting together on the ground. The plateaus require an enormous amount of years for their formation since the processes in question are extremely slow, in some cases having millions of years. In general, the use of the term refers to the plateaus that we find above sea level, but we can also talk about underwater plateaus, portions of earth's crust under the sea and that are maintained at a depth considerably less than the surrounding areas.