UNIT 1

PLATE TECTONICS

COMPOSITIONAL AND PHISICAL LAYERS

DENSITY AND TEMPERATURE VARIATION IN DEPTHTe

mpe

ratu

re

TYPES OF SEISMIC WAVES

SEISMOMETER AND SEISMOGRAM

EXPLORING THE INTERIOR WITH SEISMIC WAVES

SEISMIC WAVES VARIATION IN DEPTH

PANGEA

CONTINENTS POSITION THROUGH EARTH’S HISTORY

GEOLOGICAL EVIDENCES

Same rocks and structures on each side of the Atlantic ocean

Continents fit together along the continental shelves

PALEOCLIMATIC EVIDENCE

Glacial moraines in tropical regions

Wegener’s explanation

PALEOLITHIC EVIDENCES

CONTINENTS EVOLUTION

SEISMIC AND VOLCANIC BELTS

PLATE TECTONICS

PLATE BOUNDARIES FEATURES

TYPES OF PLATES BOUNDARIES

PLATES MOVEMENTS

Divergent boundaries

Convergent boundaries

Transform boundaries

TYPES OF SUBDUCTION BOUNDARIES

OCEAN FLOOR LANDFORMS

OCEAN FLOOR COMPOSITION

SEA FLOOR SPREADING

PLATE MOVEMENTS EXPLANATION

CONVENCTION CURRENTS