structure of the earth

• there are _ primary ___ ____, these are the core, ____ and ____?

  3, concentric layers, mantle, crust
• the crust is ____, __km in depth, mainly ____, and made of _____ and aluminium?

  thin, 35, granitic, silicon
• the lithosphere is a ___ ____?

  rigid layer
• the asthenosphere is ___ to ___km thick?

  100, 300
• the mesosphere is ____km thick?


  2,900
• the inner core is ____, it is made of __ iron and __ nickel?

  metallic, 80, 20
• the asthenosphere is ___-____?

  slow moving
• the density of the crust is ___ - ___ kg/m cubed?


  2.6, 2.7
• the asthenosphere has ___ ____?

  convection currents
• the upper mantle contains the ____ and the _____, and these two layers both make up ____ and _____ plates?

  asthenosphere, lithosphere, oceanic, continental
• the lithosphere is ____, rigid and _____?

  cool, brittle
• the asthenosphere is ___, weak and ____?

  hot, plastic
• temperature and ____ increase with ____?

  pressure, depth