Earth Science Exam #2 The Ocean
Test on Ocean Sediments, Ocean Floor, El Nino and La Nina
- 1.The element found in some sediments which suggest that a meteorite or asteroid impact occurred nearby is:
- A.
A) uranium.
- B.
B) iridium.
- C.
C) manganese.
- D.
D) strontium. D) strontium.
- 2."Black smokers" are associated with ________.
- A.
A) oceanic ridges
- B.
B) hot water
- C.
C) mineral-rich waters
- D.
D) all of these
- 3.The oceans cover approximately ________ percent of Earth's surface.
- A.
A) 70
- B.
B) 60
- C.
C) 50
- D.
D) 40
- 4.Which one of the following concerning mid-ocean ridges is false?
- A.
A) are sites for submarine eruptions of basaltic lava A) are sites for submarine eruptions of basaltic lava
- B.
B) are where young lithosphere is added to the edges of spreading, oceanic plates
- C.
C) terrigenous sediment coverings are very thin or absent
- D.
D) sediments include thick siliceous ooze deposits and sandy turbidite beds
- 5.Which of the following contains calcium carbonate (CaCO3)?
- A.
A) phosphorites
- B.
B) diatoms
- C.
C) radiolarians
- D.
D) glauconite
- E.
E) foraminiferans
- 6.The most likely place to find abundant manganese nodules is on the:
- A.
A) abyssal plain far from a continent.
- B.
B) continental rise.
- C.
C) crest of a mid-ocean ridge.
- D.
D) continental shelf.
- E.
E) All of the above locations contain manganese nodules.
- 7.Minerals that crystallize directly from seawater are examples of ________.
- A.
A) hydrogenous sediment
- B.
B) biogenous sediment
- C.
C) terrigenous sediment
- D.
D) both terrigenous and biogenous sediment
- 8.Submarine canyons form the deepest parts of the ocean basins.
- A.
True
- B.
False
- 9.Manganese nodules do not accumulate below 4500 meters depth because the manganese minerals are highly soluble in seawater below that depth.
- A.
True
- B.
False
- 10.Compared to the Southern Hemisphere, a higher percentage of the Northern Hemisphere is water covered.
- A.
True
- B.
False
- 11.The continental rise lies at the bottom of the continental slope.
- A.
True
- B.
False
- 12.Sand, silt, and clays deposited on the ocean floor are described as terrigenous sediments
- A.
True
- B.
False
- 13.A pelagic clay contains lots of material that settles to the seafloor through the water column and are:
- A.
A) more than 30% biogenous material.
- B.
B) more than 30% hydrogenous material
- C.
C) more than 30% neritic material
- D.
D) less than 30% biogenous material.
- E.
E) less than 30% neritic material.
- 14.The crests of mid-oceanic ridges ________.
- A.
A) lie at depths exceeding 6 kilometers
- B.
B) are geologically old features
- C.
C) are heavily mantled with sediment
- D.
D) contain active rift zones
- 15.Which of the following is associated with ocean ridges?
- A.
A) rift zones
- B.
B) mountainous topography
- C.
C) volcanic structures
- D.
D) all of these
- 16.Which of the following is not an important control on oceanic sediment accumulation?
- A.
A) degree of preservation
- B.
B) rate of deposition
- C.
C) input from other sediment types
- D.
D) dilution
- E.
E) All of the above factors are important.
- 17.Concerning the distribution of land and water, which of the following statements is true?
- A.
A) the Southern Hemisphere has much more water surface than the Northern Hemisphere
- B.
B) the Northern Hemisphere has much more water surface than the Southern Hemisphere
- C.
C) the percentage of land and water is about the same in both the Northern and Southern Hemispheres
- D.
D) none of the above are true
- 18.Which one of the following salts is most abundant in seawater?
- A.
A) sodium chloride
- B.
B) sodium bicarbonate
- C.
C) potassium bromide
- D.
D) magnesium chloride
- 19.Submarine canyons found on the continental slope and are believed to have been created ________.
- A.
A) by rivers during the ice age
- B.
B) because of a plate plunging into the mantle
- C.
C) by faulting
- D.
D) none of these
- 20.Submerged, flat-topped seamounts are known as guyots.
- A.
True
- B.
False
- 21.Seafloor hot springs occur mainly in oceanic, abyssal plains.
- A.
True
- B.
False
- 22.The Atlantic and Pacific basins have oceanic ridges; the Indian Ocean has no oceanic ridge
- A.
True
- B.
False
- 23.Turbidites and siliceous oozes are both biogenous sediments.
- A.
True
- B.
False
- 24.The surface waters in regions where evaporation rates are high, such as the Red Sea, have higher than average salinities
- A.
True
- B.
False
- 25.The BEST definition of the outer edge of the continental shelf is that point where ________.
- A.
A) a rapid steepening of the gradient occurs
- B.
B) the water depth reaches 100 fathoms
- C.
C) it meets an oceanic ridge
- D.
D) the gradient becomes very gentle
Questions: 14 | Attempts: 15458 | Last updated: Nov 19, 2020
-
Sample QuestionThe earth spins on an angled tilt called a(n)
Questions: 19 | Attempts: 4110 | Last updated: May 19, 2021
-
Sample QuestionThe Earth rotates in about _____ hours.
Questions: 47 | Attempts: 2752 | Last updated: May 19, 2021
-
Sample QuestionWhat are the four agents of erosion?
Back to top