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Twelfth Grade (Grade 12) Geology Questions

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Grade 12 Rocks
The majority of rocks in the crust are
  1. sedimentary.
  2. metamorphic.
  3. igneous.
  4. volcanic.
  5. topsoil.
Grade 12 Geomorphology
When continental glaciers melt, the continents                           .
  1. rise isostatically
  2. fall isostatically
  3. position remains unchanged
Grade 12 Earth's Layers
The two main reasons Earth's interior is hot are Earth's natural radioactive decay and
  1. accumulated solar heat.
  2. Earth used to be much closer to the sun during the Archean.
  3. heat from Earth's original formation.
  4. none of the above
Grade 12 Geomorphology
In a cave, where would one find a stalactite growing?
  1. From the cave floor
  2. From the cave wall
  3. From the cave ceiling
  4. Under the cave
Grade 12 Tectonics
A rift valley does NOT form at a(n)                            .
  1. site of continental rifting
  2. divergent plate boundary
  3. mid-ocean spreading center
  4. subduction zone
Grade 12 Earth's Layers
The core of Earth is made up of                   .
  1. ultramafic rock
  2. iron and nickel
  3. peridotite
  4. basalt and granite
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 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 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 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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