Yes, Yosemite National Park is a proper noun, the name of a specific place.
Plutonic Ingenious Rocks.
Plutonic Ingenious Rocks.
Plutonic Ingenious Rocks.
Basins and canyons are both valleys. A basin is a wide valley shaped like a bowl and a canyon is a very narrow valley with steep sides.
Your dictionary should give an answer such as " a narrowing of a valley between hills...". The Grand Canyon of Colorado would be a common example.
The word canyon is a common noun.
DISEASE was the most likely cause of death on the overland trails.
In this context, it is common. A specific canyon, like the Grand Canyon, is proper.
No, Grand Canyon is a proper noun; it is the name of a specific place, names are always proper nouns. A proper noun is always capitalized.
If it is the name then it is proper and should be capitalized Happy Valley but if you are saying, I saw a happy valley as in the valley was happy then it is common.
Yes, the noun 'valley' is a common noun, a general word for a type of landform.