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Earth's Layers Questions - All Grades

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Grade 7 Earth's Layers
In which layer do convection currents occur?
  1. Lithosphere
  2. Asthenosphere
  3. Outer Core
  4. Mesosphere
  5. Inner Core
Grade 8 Earth's Layers
Which statement about Earth's magnetic field is true?
  1. When molten rock cools, the iron in it no longer contains magnetic domains.
  2. Earth's magnetic field extends about 10 m above Earth's surface.
  3. It is possible for Earth's magnetic field to reverse.
  4. A magnetic pole is permanent, but a geographic pole is not.
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 7 Earth's Layers
The                 is part of the mantle that can bend like plastic.
  1. lithosphere
  2. asthenosphere
  3. lower mantle
  4. core
Grade 7 Earth's Layers
Hot spots are places on Earth's surface
  1. with really warm, tropical climates.
  2. with an abnormally large number of volcanoes.
  3. that are directly above mantle plumes.
Grade 7 Earth's Layers
a layer of molten iron and nickel that surrounds the inner core of Earth
  1. inner core
  2. mantle
  3. outer core
  4. asthenosphere
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
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