useless trivia: What Word Means: A Genus Of Deciduous Trees That Includes The Larches?

Questions

The Hawaiian Islands are the projecting tops of the biggest mountain range in the world. Mauna Kea, on the island of Hawaii, is the largest mountain on Earth - though partially submerged, it is 4,000 feet taller than -----------------?

The highest mountain in the British Isles, Ben Nevis in western ----------, is just 4,406 feet high. In many other countries, a "mountain" of this size would be considered something less than a large hill.?

The highest mountain on Earth, -------------, reaches only about halfway through the lowest layer of the troposphere.?

There are sand dunes in Arcachon, ----------- that are 350 feet high.?

The highest point in Pennsylvania is lower than the lowest point in --------------?