Ocean Ridge
Continents & ocean are first order. Mountain,pleated & plains are second order of relief features.
The thickest part of the crust is found under the highest elevated mountain ranges on the continents.
Topography.
The top of the mantle is defined by a sudden increase in seismic velocity, which was first noted by Andrija Mohorovičić in 1909; this boundary is now referred to as the "Mohorovicic discontinuity" or "Moho". Its depth ranges from about 5 km beneath the ocean floor to about 35 km below the continent, although it may reach 60 km or more under some mountain ranges.
it is called a volcano
The longest mountain ranges is the Andes Mountains in South America. The mountain ranges stretch estimate is more than 5,000 miles.
south america
The chain of mountains that form the mid-ocean-ridges are the longest mountain chains in the world.
Mountains are not usually measured in length. Mountain ranges, however, are measured this way. You may be thinking of the Trans-Antarctic mountain range, which measures about 3,500 Km in length, and is one of the longest mountain ranges on earth.
You could be thinking of the Trans-Antarctic mountain range, one of the longest mountain ranges on earth.
You may be thinking of the Trans-Antarctic mountain range, one of the longest mountain ranges on earth.
the mid-ocean ridges
The Trans-Antarctics are about 3,500 miles long, one of the longest mountain ranges on earth.
You may be thinking of the Trans-Antarctic Mountain Range, one of the longest mountain ranges on earth.
Seas, oceans, continents, mountain ranges, valleys, rivers, etc...
Volcanic islands, mountain ranges, island arcs.
You may be thinking of the Trans-Antarctic mountain range, which essentially separates East Antarctica from West Antarctica. It is one of the longest mountain ranges on earth.