THE WATER PLANET

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THE WATER PLANET

• THE EARTHS INTERIOR

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OUTLINE

• Composition of the earth
• North and south hemisphere
• Four (4) large ocean basins
• Seismic reflection and refraction
• Earths interior core, mantle, crust
• Asthenosphere, lithosphere
• isostatic rebound
• Types and characteristics of Crust
• Isostasy isostatic equilibrium

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EARTH

• 71 WATER
• LAND
• 2/3 IN NORTH HEMISPHERE
• 61 OCEAN
• SOUTH HEMISPHERE
• 80 OCEAN

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CLASSIFICATION OF OCEANS 4 LARGE BASINS

• AREA DEPTHS
• (mil km2) (m)
• PACIFIC 166.2 4, 188
• ATLANTIC 86.5 3, 376
• INDIAN 73.4 3, 872
• ARCTIC 9.5 1, 330

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EARTHS INTERIOR

• WAYS TO KNOW EARTHS INTERIOR
• SEISMIC REFRACTION
• SEISMIC REFLECTION

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INTERNAL STRUCTURE

• CORE
• SOLID, INNER,
• mixtures of Fe
• swirling motion responsible for magnetic field
• - LIQUID, OUTER

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• MANTLE
• UPPER SOLID HOT
• FLOWS LIKE LIQUID
• ASTHENOSPHERE LOWER MANTLE, RELATIVELY FLUID

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• CRUST - OUTERMOST, THIN LAYER, thickness varies
• LITHOSPHERE Earths crust and upper
  mantle makes up tectonic plates

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• Asthenia weak
• Litho rock

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TYPES OF CRUST

• OCEANIC
• CONTINENTAL

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Abundance Fe, Mg Na, K, Ca, Al
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ISOSTASY

• geophysical phenomenon
• force of gravity acting on crustal materials of
  various densities (mass per unit volume) that
  affects the relative flotation of crustal plates.
  
• Isostasy specifically describes the naturally
  occurring balance of mass in Earth's crust.

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• ISOSTATIC EQUILIBRIUM
• Balance bet. weight of crust and buoyancy
  provided by the mantle
• ISOSTATIC REBOUND

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