General science

• Planet earth

  34.6 % Iron

  29.5% Oxygen

  15.2 % Silicon

  12.7 %Magnesium
• Axis 23.5 tilted

  Rotation 24 hours

  Revolution 365 dqys 1/4

  Leap year 366 days
• Equilateral Radius 6378

  Polar radius 6357

  Equilateral Circukference 40076

  Polar circumference 40008

  Volume 26000000000 mi3

  Density 5.52
• Crust

  Outermost layer of the arth
• Continental

  Sial
• Oceqnic

  Sima
• Lithosphere

  Enture crust and uppermost mantle and forms earth relatively cool,rigid outer shell
• Asthenosphere

  Soft,comparatively weak layer beneath the lithosphere
• Mantle

  Semi-molten iron and magnesium silicater layer that makes up 80 % eaths volume
• Mesosphere

  Lower mantle,solid,rocky layer
• Core

  Innermost and densest layer of the earth

  Outer core

  Molten Metallic layer

  Inner core

  Solid iron part due to immense pressure
• Mohorovicic

  Between crust and mantle
• Gutenberg

  Between mantle and core
• Lehmann

  Between outer core and inner core
• Continental Drift theory

  Proposed by Alfred Wegener
• Pangaea

  Supercontinent
• Panthalassa

  Single vast ocean by pangaea
• Laurasia

  Northern part

  Gondwanaland

  Sothern part
• Plate tectonics

  States the earth rigid outershells

  Lithospheric plates

  Broken into numerous slabs,continual motion
• Transform

  Slide past each other
• Convergent

  Plates move towards each other
• Divergent

  plates move apart
• Sea-floor spreading

  Features of the oceqn floor and why drifting of continents take place
• Earthquake

  Shaking of the ground by the sudden breaking and shifting of large secfions
• Focus

  Origin of the earthquake
• Epicenter

  Point in the surface directly above the focus
• Faults

  Break in a rock mass
• Normal fault

  Hanging wall moves down,divergent boundarues
• Reverse fault

  Convergent boundaries
• Strije slip fault

  Side by side sliding movement
• Tension forces

  Strech rock layers from opposite directions,rock layers pulled apart
• Compression forces

  Push rock layers from opposite sides
• Shearing forces

  Pull rock layers in different directions
• Tsunami

  Large destructive waves caused by an earthquake
• Seismic waves

  Waves of energy result low frequency acoustic energy
• Body waves

  Travel throughs the earth interior
• Primary waves

  Displaced parallel to the direction of the wave, can travel through solid and liquid
• Secondary waves

  Displaced perpendicular to the direction of the wave can travel through liquid
• Surfaces waves

  Travel along earths surface
• Love wave

  Fastest surface wave and move the ground from side to side