Layers and Composition

• There are two types of crust?

  Continental (Older) and Oceanic (Younger).
• It can be divided into upper and lower mantle, separated by the?

  Repetti discontinuity
• The core begins at mantle-core boundary, is called? Located at the 2,900 km depth.

  Gutenberg discontinuity
• The Core's composition comprises some?

  Fe-Ni (iron and nickel) alloy
• (Means "stone") Thick and brittle layer comprising the entire crust and uppermost layer of the upper mantle?

  Lithosphere
• ( Means "weak”) Mechanically weak layer consisting of the lower portion of the upper mantle?

  Asthenosphere
• The upper mantle comprises an Mg- and Fe-rich rock called ___?

  Peridotite
• (Means “middle”) Beneath the asthenosphere is the ___ ?

  Mesosphere
• The dominant rock type in this layer is a silicate rock called ___?

  Perovskite
• The outer core is only one made out of liquid-___, to be exact.

  Melted Fe-Ni alloy
• The outer-inner core boundary is also known as the ___?

  Lehmann discontinuity
• The overwhelming pressure in this layer forces the inner core to be?

  Solid ball of mostly Fe
• Fill up the Blanks

  A) LIthosphere

  B) Asthenosphere

  C) Mesosphere

  D) (Rigid)

  E) (Plastic)

  F) (Solid)

  G) (Liquid)

  H) (Solid)

  I) (Iron and Nickel)

  J) (Silicates)

  K) (Silicates)
• Contrary to popular belief of Asthenosphere, it is not a?

  Sea of molten rock
• Inner core are similar to the temperatures of the surface of the Sun—around more than?

  5400°C
• The Earth can be subdivided into layers based on two criteria?

  Composition (density) differences and physical properties.
• The boundary between crust and mantle is called the?

  Mohorovičić discontinuit