The Sunken World was created in 1948.
Sunken is an adjective describing something which has sunk to the bottom of a body of water. "Sunken treasure" is at the bottom of the sea. They are all forms of the verb "to sink" "We said we'd sink the Bismark, and, by God, we did sink her. Now although she sank a long time ago, divers have gone down to take pictures of her sunken wreck."
A wreckage
No, "courtyard" is not a collective noun. A collective noun refers to a word that represents a group of individuals or items, such as "team" or "flock." "Courtyard" describes a specific type of outdoor space, typically enclosed by buildings or walls, and does not denote a collection of entities.
shockwaves
Courtyard
Sunken is not a verb so it doesn't have present or past tense. Sunken is an adjective
generally xerophytic plants have sunken stomata
Put the patio furniture in the courtyard.
Sunken Treasures was created in 1993.
The Sunken Cemetery was created in 2002.
The Sunken Billions was created in 2008.
The Sunken World was created in 1948.
The opposite of a sunken area would be a raised area or an elevated area.
Courtyard by Marriott was created in 1985.
Courtyard Theatre was created in 2006.
Peter is a man who is currently in the courtyard.