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Seventh Grade (Grade 7) Oceanography and Hydrology Questions

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Grade 7 Oceanography and Hydrology
A fan-shaped deposit at the mouth of some rivers is called a(n)
  1. pyramid.
  2. alluvial fan.
  3. dune.
  4. delta.
Grade 7 Oceanography and Hydrology
A topographic map shows how deep an ocean is.
  1. True
  2. False
Grade 7 Oceanography and Hydrology
Standing freshwater forms ponds and lakes.
  1. True
  2. False
Grade 7 Oceanography and Hydrology
These currents are responsible for a slow mixing of water between the surface and deeper ocean.
  1. Surface currents
  2. Deep ocean currents
  3. Density currents
  4. California currents
  5. Global surface currents
Grade 7 Oceanography and Hydrology
What mathematical unit is used to measure salinity?
  1. parts per thousand (ppt)
  2. parts per million (ppm)
  3. parts per billion (ppb)
  4. none of the above
Grade 7 Oceanography and Hydrology
Estuaries are fed by a constant supply of
  1. mud.
  2. silt.
  3. detritus.
  4. all of the above
  5. none of the above
Grade 7 Oceanography and Hydrology
Ocean water also contains                 , which are chemicals to help stabilize the pH of water.
  1. desalination
  2. buffers
  3. dissolved oxygen
  4. diatomic
Grade 7 Oceanography and Hydrology
What is the average salinity at the ocean surface?
  1. 35 ppt
  2. 40 ppt
  3. 45 ppt
  4. 25 ppt
Grade 7 Oceanography and Hydrology
China's Yangtze River is the longest river in Asia. The Yangtze River drains water from almost one-fifth of China's land area. It starts from melting glacial water in the mountains of the Tibetan Plateau. Its waters ultimately drain into the East China Sea.

Which sentence describes the headwaters of the Yangtze River?
  1. China's Yangtze River is the longest river in Asia.
  2. The Yangtze River drains water from almost one-fifth of China's land area.
  3. It starts from melting glacial water in the mountains of the Tibetan Plateau.
  4. Its waters ultimately drain into the East China Sea.
Grade 7 Oceanography and Hydrology
Hot springs in the ocean floor are called thermal vents.
  1. True
  2. False
Grade 7 Oceanography and Hydrology
Cyanobacteria is                 algae.
  1. blue-green
  2. red
  3. green
  4. blue
Grade 7 Oceanography and Hydrology
Ridge of sand built up by currents in a river or coastal waters
  1. stockade
  2. sandbar
  3. beach
  4. mountain
Grade 7 Oceanography and Hydrology
The energy that produces ocean waves comes from what?
  1. the rise and fall of the tides
  2. rivers flowing into the ocean
  3. wind blowing across the water’s surface
  4. rock falling into the ocean along the shore
Grade 7 Oceanography and Hydrology
What does "hydro" mean?
  1. Water
  2. Away from, Out from
  3. To carry
  4. Under or Below
Grade 7 Oceanography and Hydrology
What is the approximate density of the ocean surface?
  1. 1,027 kg/m3
  2. 1,030 kg/m3
  3. 1,033 kg/m3
  4. 1,034 kg/m3
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