Question

continental shelf
seamounts
continental slope
abyssal zone
mid - ocean ridge
oceanic trench
the ocean drops down 3 to 5 km at the edge of shallow water near the coast.
the part of a continent that is underwater teems with land - based and water - dwelling wildlife.
the flat, wide - open area of the ocean floor varies from 2000 to 6000 m deep.
long, underwater mountain ranges are found at divergent plate boundaries where new oceanic crust is created.
subduction causing one plate to slide beneath the other creates a deep valley.
steep underwater mountains do not reach the surface of the ocean and may have flat tops called guyots.

Explanation:

• Continental shelf: The ocean drops down 3 to 5 km at the edge of shallow water near the coast. This is characteristic of the continental shelf which is the submerged edge of the continent with relatively shallow water near the coast.
• Continental slope: The part of a continent that is underwater teems with land - based and water - dwelling wildlife. The continental slope is the steeply sloping area between the continental shelf and the deep - ocean floor and has diverse marine life.
• Abyssal zone: The flat, wide - open area of the ocean floor varies from 2000 to 6000 m deep. The abyssal zone is the deep, flat region of the ocean floor.
• Mid - ocean ridge: Long, underwater mountain ranges are found at divergent plate boundaries where new oceanic crust is created. Mid - ocean ridges are underwater mountain ranges formed at divergent plate boundaries.
• Oceanic trench: Subduction causing one plate to slide beneath the other creates a deep valley. Oceanic trenches are formed by subduction (one tectonic plate sliding beneath another).
• Seamounts: Steep underwater mountains do not reach the surface of the ocean and may have flat tops called guyots. Seamounts are underwater mountains, and guyots are flat - topped seamounts.

Answer:

1. continental shelf: The ocean drops down 3 to 5 km at the edge of shallow water near the coast.
2. continental slope: The part of a continent that is underwater teems with land - based and water - dwelling wildlife.
3. abyssal zone: The flat, wide - open area of the ocean floor varies from 2000 to 6000 m deep.
4. mid - ocean ridge: Long, underwater mountain ranges are found at divergent plate boundaries where new oceanic crust is created.
5. oceanic trench: Subduction causing one plate to slide beneath the other creates a deep valley.
6. seamounts: Steep underwater mountains do not reach the surface of the ocean and may have flat tops called guyots.