Ocean Floor Vocabulary - Mr. Thompson`s Earth Science Page

Vocabulary for S6E3c
1. On a sheet of paper, you need to write the Unit E.Q., Lesson E.Q., and Learning Objective below:
 Unit E.Q.: How does water play a significant role in the Earth’s processes?
 Lesson E.Q.: How is the ocean floor like the surface of the Earth?
 Learning Objectives: I can describe the composition, location, and subsurface topography
of the world’s oceans. (S6E3c)
2. After you have written the items above, you need to write the words and definitions below.
 Vocabulary:
1. Subsurface-below the surface, especially of a body of water
2. Topography-the detailed mapping or charting of the features of a relatively small area,
district, or locality
3. Salinity-a measure of the amount of salts dissolved in seawater
4. Salt-a crystalline compound, sodium chloride, NaCl, occurring as a mineral, a constituent of
seawater, etc., and used for seasoning food, as a preservative, etc.
5. Sea Mounts-an underwater mountain rising several hundred meters above the floor of the
sea but having its top well below the surface of the water
6. Trench-a long, steep-sided, narrow depression in the ocean floor formed when one plate
sinks beneath another
7. Abyssal Plain-flat seafloor area from 4,000-6,000 meters below the ocean surface, formed
by the deposition of sediments
8. Continental Shelf-the part of a continent that is submerged in relatively shallow sea
9. Continental Slope-a steep slope separating a continental shelf and a deep ocean basin
10. Mid-ocean Ridge-any of several seismically active submarine mountain ranges that extend
through the Atlantic, Indian, and South Pacific oceans: each is hypothesized to be the
location of seafloor spreading due to lava erupting through cracks in the crust and cooling to
form new seafloor
11. Geyser-a hot spring that periodically sends up fountain-like jets of water and steam into the
12. Black Smoker-the hottest hydrothermal vents that spew iron and sulfide which combine to
form iron monosulfide, a black compound
13. Hydrothermal Vent-an opening on the floor of a sea out of which flows water that has been
heated by underlying magma and usually contains dissolved minerals that precipitate out of
it upon contact with the colder seawater, building a stack of minerals, or chimney
14. Subduction Zone-the point under the ocean where the collision of the earth's crustal plates
results in an oceanic plate being drawn down or overridden by a continental plate
3. After you are done copying the words and definitions, you need to draw your pictures of the
*You will get a grade for copying the words and definitions and a grade for the pictures.*