The correct answers are:
- With number 1 are marked the Rocky Mountains;
The Rocky mountains are the dominant relief feature in the western part of the United States, and they are also the longest mountain range in the North American continent.
- With number two are marked the Sierra Madres;
The Sierra Madres are the dominant mountain range in Mexico, and it occupies the northern half of the country. It is a geologically very active mountain.
- With number 3 are marked the Appalachian Mountains;
The Appalachian Mountains are one of the oldest mountains in the world. In the past they were reaching heights similar to the Rocky Mountains, but due to the erosion it has lost i height significantly over time.
