Seafloor Topography (Grade 9)
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Seafloor Topography
1.
The deepest known point in any of the oceans is the Challenger Deep located in the Marianas Trench in the South Pacific near Guam.
- True
- False
2.
The topography of the ocean floor is
- lacking any significant features.
- less varied than that of the continents.
- as varied as that of the continents.
- not comparable to the topography of the continents.
3.
This is a 1 to 2 kilometer deep, several kilometers wide, landfrom which splits many segments of the oceanic-ridge crust.
- continental shelf
- mid-oceanic ridge
- oceanic crust
- rift valley
4.
This long, narrow depression is formed when the sinking tectonic plate drags the seafloor downward.
- island arc
- volcano
- oceanic trench
- rift valley
5.
Seamounts
- are a special type of oceanic trench.
- are volcanoes that form on the ocean floor.
- form only in the Pacific Ocean basin.
- are submarine canyons found near Australia.
6.
The most prominent features of the ocean basins are the . They are the mountains of the deep ocean floor.
- continental rises
- hydrothermal vents
- ocean basins
- mid-ocean ridges
7.
This hole in the deep seafloor releases hot fluid heated by magma.
- abyssal plain
- mid-ocean ridge
- volcano
- hydrothermal vent
8.
These are large depressed crevices in the deep ocean floor.
- deep-sea trenches
- hydrothermal vents
- shelf break
- ocean crust
9.
What are the abyssal plains?
- the bottom of the ocean where little light penetrates allowing for very little life
- the large flat region of the open ocean floor
- a section of the ocean floor that rises to connect open ocean floor to continental shelf
- a steep incline leading down from the edge of the continental shelf
10.
What is the continental shelf?
- the bottom of the ocean where little light penetrates therefore there is very little life
- the large flat region of the open ocean floor
- a gently sloping shallow area of the ocean floor that extends outward from the edge of the continent
- a steep incline leading down from the edge of the continental shelf
11.
What is a guyot?
- a tide with the greatest difference between high and low tide when the Sun and Moon are aligned in a line with Earth
- a tide with the least difference between low and high tide that occurs when the Sun and Moon pull at right angles to each other
- a seamount with a flat top
- mountain ranges from each ocean connecting to form a gigantic mountain system
12.
What is the continental rise?
- the bottom of the ocean where little light penetrates therefore there is very little life
- a section of the ocean floor that rises to connect open ocean floor to continental shelf
- a gently sloping, shallow area of the ocean floor that extends outward from the edge of the continent
- a steep incline leading down from the edge of the continental shelf
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