LAYERS OF THE EARTH

• crust - is made from solid rock, mostly basalt and granite
• crust - outer layer of rock where human and animals leave, and plants grow
• TYPES OF CRUST

  • oceanic crust
  • continental crust
• oceanic crust - a crust that is denser and thinner, made of basalt
• continental crust - a crust that is less dense and thicker, made of granite
• mantle - is made of magma

  • hot and semi-solid magma layer consists of elements like iron, magnesium, and silicon
• mantle - largest layer of earth's interior, made of solid rock and molten rock
• mantle - layer between crust and outer core
• REGIONS OF MANTLE

  • upper mantle
  • lower mantle
• UPPER MANTLE: part of the lithosphere

  LOWER MANTLE: not part of the lithosphere
• UPPER MANTLE: has lower temperature

  LOWER MANTLE: has higher temperature
• UPPER MANTLE: has lower pressure

  LOWER MANTLE: has higher pressure
• Lithosphere - where the surface of the earth is divided into tectonic plates that are constantly slowly shifting
• REGIONS OF CORE

  • outer core
  • inner core
• outer core - is a core made of liquid iron and metal, and nickel
• inner core - is a core made of solid iron and metal
• EARTH'S INTERIOR IS HOT DUE TO:

  • the heat from when planet formed (accretion)
• EARTH'S INTERIOR IS HOT DUE TO:

  • the heat from decay of radioactive elements
• EARTH'S INTERIOR IS HOT DUE TO:

  • frictional heating caused by denser core, material sinking to the center of the planet
• Radioactive decay of elements in earth's mantle and crust results in production of daughter isotopes and release heat energy - reason why earth's interior is hot
• Radioactive elements (Potassium, Uranium, Thorium) break through process called radioactive decay in crust and mantle that adds heat and slows the cooling of earth
• During accretion, earth is thought to have been shock heated by the impacts of meteorite sized bodies and larger planetesimals. For a meteorite collision, the heating is concentrated near the surface where the impact occurs, which allows heat to radiate back to space
• As earth grew larger, the increased pressure of earth's interior caused it to compress and heat up. Heat comes from friction when melted material was redistributed within earth forming the core and mantle
• Friction: released by outer core and mantle.
• It is the heat energy that is released as a result of friction produced by different response of outer core and lower mantle face to the force fields generated by moon and sun
• LAYERS OF THE EARTH

  A) crust

  B) upper mantle

  C) lower mantle

  D) outer core (liquid)

  E) inner core (solid)

  
• LAYERS OF THE EARTH

  A) atmosphere

  B) continental crust

  C) oceanic crust

  D) lithosphere

  E) asthenosphere

  F) upper mantle

  G) mantle

  H) outer core

  I) inner core