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Twelfth Grade (Grade 12) Earth Science Questions

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Grade 12 Oceanography and Hydrology
What forms when a large chunk of ice breaks off of an ice shelf?
  1. Iceberg
  2. Crevasse
  3. Aquifer
  4. Ice age
Grade 12 Rocks
Glacial till is
  1. first carried by a glacier then deposited by a stream.
  2. sediment carried by the top part of the glacier.
  3. deposited directly from glaciers and has sediment of a variety of sizes all mixed together.
  4. found evenly distributed across Earth's landmasses.
Grade 12 Oceanography and Hydrology
What is a stream's gradient defined by?
  1. Steepness
  2. Velocity
  3. Discharge
  4. The water cycle
Grade 12 Earth's Layers
Layers in the mantle are created by variations in strength due to which reason?
  1. increasing pressure and temperature with depth
  2. changes in the elements the mantle is composed of
  3. increase in friction with depth
  4. all of the above
Grade 12 Environmental Science
When Earth cools, glaciers form and reflect heat back to the atmosphere causing additional cooling. This is an example of
  1. gradualism.
  2. a feedback cycle.
  3. catastrophism.
  4. global warming.
Grade 12 Atmosphere
What direction do Westerlies blow?
  1. North
  2. South
  3. East
  4. West
Grade 12 Tectonics
Secondary waves can travel through which material state?
  1. solid
  2. liquid
  3. gas
  4. all of the above
Grade 12 Geomorphology
How does an alpine glacier modify the valley through which it moves?
  1. deepens it
  2. straightens it
  3. widens it
  4. all of these answers
Grade 12 Oceanography and Hydrology
What is the name of the sharp, jagged ridge that forms between cirques?
  1. Arete
  2. Horn
  3. Crevasse
  4. Moraine
Grade 12 Historical Geology
Which of the following may have contributed to climatic changes related to the most recent ice age?
  1. volcanic eruptions
  2. wobbling of Earth's axis
  3. variations in the shape of Earth's orbit
  4. all of these answers
Grade 12 Earth's Layers
The asthenosphere is weak, hot and                .
  1. light
  2. unyielding
  3. plastic
  4. rigid
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