Basic structure of the Earth

• What is the order of the structure of the Earth?

  Crust, Lithosphere, Asthenosphere, Lower mantle, Outer core, Inner core
• What are the two types of crusts?

  Continental and Oceanic
• What is the thickness of continental crust?

  30-70 km
• What is the thickness of oceanic crust?

  1. 7 km
• What is the lithosphere?

  A rigid, cool outer layer of the Earth
• How thick is the lithosphere?

  100 km
• What is the asthenosphere?

  The ductile rocky layer beneath the lithosphere
• What is the lower mantle?

  A solid rocky layer due to increased pressure
• What is the thickness of the asthenosphere?

  200 km
• What is the outer core composed of?

  Liquid iron and nickel
• What is the temperature range of the outer core?

  4500-6000 degrees
• What is the inner core?

  The hottest part of the Earth, solid due to pressure
• What is the temperature of the inner core?

  6000 degrees
• What are the characteristics of continental crust?

  10-70 km thick, buoyant, older, lighter
• What are the characteristics of oceanic crust?

  Thin, dense, younger
• What is the Moho discontinuity?

  The boundary between the Earth's crust and mantle
• How is the Moho discontinuity defined?

  By a change in velocity of seismic waves
• What is the significance of the Moho discontinuity in geology?

  It indicates a distinct change in rock densities