GEOPHYSICS,SUBJECT,NATURAL SCIENCE,CONCERNED,PHYSICAL,PHYSICAL PROPERTIES,THE EARTH,SPACE ENVIRONMENT,QUANTITATIVE METHODS,ANALYSIS,TERM,SOMETIMES,GEOLOGICAL,APPLICATIONS,EARTHS SHAPE,GRAVITATIONAL,MAGNETIC FIELDS,INTERNAL,STRUCTURE,COMPOSITION,DYNAMICS,SURFACE,EXPRESSION,PLATE TECTONICS,GENERATION,MAGMA,VOLCANISM,ROCK,FORMATION,MODERN,ORGANIZATIONS,DEFINITION,THE WATER CYCLE,SNOW,ICE,FLUID DYNAMICS,THE OCEANS,THE ATMOSPHERE,ELECTRICITY AND MAGNETISM,IONOSPHERE,MAGNETOSPHERE,SOLAR TERRESTRIAL RELATIONS,ANALOGOUS,PROBLEMS,THE MOON,OTHER PLANETS,DISCIPLINE,THE CENTURY,ORIGINS,DATE,ANCIENT TIMES,MAGNETIC,COMPASSES,LODESTONE,ROLE,THE HISTORY OF,NAVIGATION,SEISMIC,INSTRUMENT,ISAAC NEWTON,THEORY OF,MECHANICS,THE TIDES,PRECESSION OF THE EQUINOX,INSTRUMENTS,DEVELOPED,MEASURE,DENSITY,GRAVITY FIELD,COMPONENTS,REMOTE,EXPLORATION,SOLID EARTH,OCEAN,ESSENTIAL,DEVELOPMENT OF,THEORY OF PLATE TECTONICS,SOCIETAL,NEEDS,MINERAL RESOURCES,MITIGATION,NATURAL HAZARDS,ENVIRONMENTAL PROTECTION,GEOPHYSICAL SURVEY,DATA,USED TO,ANALYZE,POTENTIAL,PETROLEUM,RESERVOIRS,MINERAL DEPOSITS,LOCATE,GROUNDWATER,FIND,ARCHAEOLOGICAL,RELICS,DETERMINE,THICKNESS,GLACIERS,SOILS,ENVIRONMENTAL REMEDIATION,INTERDISCIPLINARY,GEOPHYSICISTS,AREA,SCIENCES,CLEARER,IDEA,SECTION,PHENOMENA,PHYSICS,RELATE,TO THE EARTH,SURROUNDINGS,GRAVITATIONAL PULL,GIVE,RISE,HIGH TIDES,TIDES,LUNAR DAY,HOURS,MINUTES,THEREFORE,HIGH TIDE,LOW TIDE,GRAVITATIONAL FORCES,ROCKS,PRESS,DOWN,DEEPER,INCREASING,DEPTH,MEASUREMENTS,GRAVITATIONAL ACCELERATION,GRAVITATIONAL POTENTIAL,EARTHS SURFACE,ABOVE,BE USED TO,LOOK,GRAVITY ANOMALY,GRAVIMETRY,THE SURFACE,GRAVITATIONAL FIELD,INFORMATION,THE DYNAMICS,TECTONIC PLATES,GEOPOTENTIAL,GEOID,DEFINITION OF,SHAPE OF THE EARTH,GLOBAL,MEAN SEA LEVEL,EQUILIBRIUM,CONTINENTS,CANALS,COOLING,HEAT FLOW,EARTHS MAGNETIC FIELD,GEODYNAMO,MANTLE CONVECTION,SOURCES,HEAT,PRIMORDIAL,RADIOACTIVITY,CONTRIBUTIONS,PHASE TRANSITIONS,THERMAL CONVECTION,THERMAL,BOUNDARY LAYERS,THE CORE,MANTLE,BOUNDARY,THE LITHOSPHERE,TRANSPORTED,CONDUCTION,FROM THE BOTTOM,THE MANTLE,MANTLE PLUMES,THE HEAT,FLOW,GEOTHERMAL ENERGY,SEISMIC WAVE,VIBRATIONS,TRAVEL,EARTHS INTERIOR,ENTIRE,EARTH,OSCILLATE,NORMAL MODES,FREE,GROUND,WAVES,MEASURED,THE WAVES,COME FROM,EARTHQUAKE,EXPLOSION,LOCATION,THE SOURCE,EARTHQUAKES,SEISMIC WAVES,SOURCE OF INFORMATION,THE REGION,COMPOSITION OF,THE ROCK,CHANGES,SUDDENLY,REFLECTIONS,SURFACE STRUCTURE,DIRECTION,INFER,THE DEEP,STRUCTURE OF THE EARTH,POSE,RISK,HUMANS,UNDERSTANDING,DEPEND,TYPE,DEEP FOCUS,LEAD,ESTIMATES,IMPROVEMENTS,EARTHQUAKE ENGINEERING,NOTICE,ELECTRICITY,ALWAYS,ELECTRIC FIELD,POSITIVE CHARGE,BOMBARDMENT,COSMIC RAYS,CURRENT,FLOWS,CIRCUIT,THE FLOW,LIGHTNING,BELOW,THE CLOUDS,SPRITE,VARIETY,ELECTRIC,SPONTANEOUS POTENTIAL,THE GROUND,OF MAN,NATURAL,TELLURIC CURRENT,CAUSES,ELECTROMAGNETIC INDUCTION,EXTERNAL,ORIGIN,FIELD,MOTION,CONDUCTING,BODIES,PERMANENT,MAGNETIC FIELD,DETECT,VARIATIONS,ELECTRICAL RESISTIVITY,UNDERGROUND,STRUCTURES,ELECTRIC CURRENT,THEMSELVES,INDUCED POLARIZATION,TOMOGRAPHY,ELECTROMAGNETIC WAVES,OUTER CORE,DAWN CHORUS,BELIEVED,CAUSED,HIGH,ENERGY,ELECTRONS,CAUGHT,THE VAN,ALLEN,RADIATION BELT,WHISTLERS,LIGHTNING STRIKES,HISS,SEISMO ELECTROMAGNETICS,ELECTRIC CURRENTS,CONDUCTIVE,LIQUID,IRON,CREATE,WAVE,MAGNETOHYDRODYNAMIC,THE EARTHS CORE,PROBABLY,LITTLE,OBSERVABLE,ROSSBY WAVES,BE ONE,GEOMAGNETIC SECULAR VARIATION,ELECTROMAGNETIC,TRANSIENT ELECTROMAGNETICS,MAGNETOTELLURICS,SOLAR WIND,THE FLUID,UPPER,ATMOSPHERE,AURORAS,DIPOLE,IT CHANGES,OVER TIME,PHENOMENON,GEOMAGNETIC POLE,STAYS,GEOGRAPHIC POLE,RANDOM,AVERAGING,MILLION YEARS,POLARITY,GEOMAGNETIC POLARITY TIME,SCALE,THE LAST,CHANGE,FREQUENCY,RECENT,BRIEF,COMPLETE,REVERSAL,LASCHAMP EVENT,YEARS AGO,GLACIAL PERIOD,GEOLOGISTS,GEOMAGNETIC REVERSAL,VOLCANIC,MAGNETOSTRATIGRAPHY,CORRELATION,NATURAL REMANENT MAGNETIZATION,SIGNATURE,SEEN,PARALLEL,LINEAR,MAGNETIC ANOMALY,STRIPES,SEAFLOOR,QUANTITATIVE,SEAFLOOR SPREADING,BASIS,MAGNETIC REVERSALS,CONSTRUCT,SCALES,ADDITION,MAGNETIZATION,RADIOACTIVE DECAY,INTERNAL HEAT,ISOTOPES,RADIOACTIVE,ELEMENTS,RADIOMETRIC DATING,PRIMARY,METHOD,ABSOLUTE TIME,GEOCHRONOLOGY,UNSTABLE,DECAY,RATES,THE DECAY,COVER,ORDERS,MAGNITUDE,EVENTS,PAST,ERAS,RADIOMETRIC,AIRBORNE,GAMMA,CONCENTRATION,RADIOISOTOPES,USEFUL,LITHOLOGY,ALTERATION,FLUID,CORE,VISCOSITY,GEODYNAMICS,ISOSTASY,POST GLACIAL REBOUND,MANTLE PLUME,GEOPHYSICAL FLUID DYNAMICS,TOOL,IN PHYSICAL,OCEANOGRAPHY,METEOROLOGY,ROTATION,THE CORIOLIS EFFECT,PATTERNS,DETERMINES,CIRCULATION,STORMS,DRIVE,KELVIN WAVES,EKMAN SPIRALS,STRUCTURED,TAYLOR COLUMNS,MAGNETOHYDRODYNAMICS,MINERALS,MUST,UNDERSTOOD,COMPOSITION OF THE EARTHS,INTERIOR,SEISMOLOGY,GEOTHERMAL GRADIENT,MINERAL,PHYSICISTS,STUDY,ELASTIC PROPERTIES OF,HIGH PRESSURE,PHASE,MELTING POINTS,EQUATIONS OF STATE,RHEOLOGICAL,PROPERTIES,ABILITY,DEFORMATION,CREEP,POSSIBLE,SHORT,TIMES,BRITTLE,TEMPERATURE,PRESSURE,TURN,MOVE,WATER,COMPLEX,SUBSTANCE,UNIQUE,SHAPE,HYDROSPHERE,CLIMATE,EVAPORATION,THERMAL GRADIENT,THE MANY,PRECIPITATION,INVOLVE,MIXTURE,COALESCENCE,SUPERCOOLING,SUPERSATURATION,PRECIPITA