Sunlit zone is depth of water exposed to sunlight, trenches is a long narrow ditch.
B. Deforestation is a way to clear land and plant more by humans but the other answers are natural things that happen in the environment.
The answer to this question is slate. Slates are homogenous
metamorphic rock that came from a sedimentary rock that was formed thru metamorphism.
Slates are rocks that are used as roofs and floorings because slates are considered
to be durable and because of the fine features of this rocks it is more
presentable.
The Arctic ocean is the smallest of the world's five oceans
