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Ninth Grade (Grade 9) Earth's Layers Questions

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Grade 9 Earth's Layers
The                 is composed of both crust and portion of the upper mantle.
  1. lithosphere
  2. hydrosphere
  3. atmosphere
  4. asthenosphere
Grade 9 Earth's Layers
What is one reason that Earth's core is so hot?
  1. Coal and oil burn in the core, creating a giant furnace.
  2. As heavy elements in the core decay, they produce radioactive heat.
  3. The Sun heats up Earth and causes the inside to melt.
  4. When any planet reaches a certain size, it becomes hot inside.
Grade 9 Earth's Layers
The core of the earth is composed primarily of which two elements?
  1. iron and sulfur
  2. iron and nickel
  3. nickel and cobalt
  4. silicon and oxygen
Grade 9 Earth's Layers
The boundary between the mantle and the core is the                           .
  1. Mohorovicic discontinuity.
  2. Gutenberg discontinuity.
  3. anticline discontinuity.
  4. syncline discontinuity.
Grade 9 Earth's Layers
The earth can be divided by composition or by mechanical properties. Which divisions are based on its composition?
  1. core, mantle, crust
  2. lithosphere, asthenosphere
  3. atmosphere, hydrosphere
  4. none of the above
Grade 9 Earth's Layers
The                   represents about 68% of Earth's mass.
  1. crust
  2. mantle
  3. core
  4. none of the above
Grade 9 Earth's Layers
Heat from Earth's interior is called the mantle.
  1. True
  2. False
Grade 9 Earth's Layers
The Mohorovicic discontinuity, more easily pronounced as the "Moho," is
  1. the boundary between the crust and the mantle.
  2. the boundary between the mantle and the core.
  3. an earthquake wave that travels along the Earth's surface.
  4. the boundary between the continental shelf and the ocean floor.
Grade 9 Earth's Layers
In what field do scientists study the processes that change Earth's composition?
  1. climatology
  2. hydrology
  3. geochemistry
  4. paleontology
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