The Oceans - Chapter 1: Features of the Ocean Basin Floor Flashcards
Long, relatively narrow features that represent the deepest part of the ocean
deep-ocean trenches
Trenches are the sites where moving crustal plates are destroyed as they ____
plunge back into the mantle
What type of activity is associated with trench regions?
Igneous
Trenches in the open ocean are often paralleled by
Volcanic island arcs
These are incredibly flat features that are likely the most level places on earth
Abyssal plains
The monotonous topography of abyssal plains will occassionally be interrupted by ____
protruding summit of buried volcanic structure
What do abyssal plains consist of?
thick accumulation of sediment, deposited on the low rough portions of ocean floor
True or false: tubidite deposits are interbedded with sediments composed of minute clay-sized particles that continuously settle on the ocean floor
True
Where are abyssal plains more widespread?
Where there are no deep ocean trenches adjacent to the continents
Since the Atlantic Ocean has ______ to act as traps for sediments, it has more extensive abyssal plains
fewer trenches
These dot the ocean floors and are isolated volcanic peaks that may rise hundreds of meters above the surrounding topography
seamounts
The submerged flat topped seamounts that occur when islands gradually sink as the moving plate slowly carries them from the oceanic ridge area
Guyots