Mountain
In usual text, snow-covered would probably be hyphenated - otherwise the sentence could be misinterpreted - consider the difference between the concept of "snow-covered mountains" and the sentence "snow covered mountains".
why is 3/4 of japan covered with mountains
mountains
The terrain was mountainous because is was covered in mountains. (sorry if this is wrong, in 6th grade!!!) Hannah M.
The majestic snow-covered mountains were breath-taking.
it is covered 1/4 of korea
The Alps are tall mountains that are covered with snow all year in Europe.
four-fifths of greece is covered in mountains
The eagle soars high above the mountains. The hiker's feet were covered in painful sores from the long trek.
maybe
In that sentence, you can replace the word structure with the word mass, so that the question reads:"All but two percent of Antarctica's land mass is covered by ice."
Approximately 20-25% of the Earth's surface is covered by mountains. This includes ranges such as the Himalayas, Andes, Rockies, and Alps.