Describe the purpose of the text under the map about marking and identifying geographical features.

The text provides instructions for a geographical exercise. It directs the user to:

• Mark major active volcanoes in the Northern Hemisphere with a red marker.
• Label specific mountain systems on the map: the Cordilleras, Alps, Himalayas, Ural Mountains, and the Great Dividing Range.
• Mark the highest points on each continent, label them with their names and absolute elevations, and then number the continents from 1 to 6 in descending order of the marked points' elevations.

Essentially, it's a guided activity to reinforce knowledge of continental geography, volcanoes, and mountain ranges.