The Earth’s Internal Processes: Continental Drift Theory

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Presentation transcript:

The Earth’s Internal Processes: Continental Drift Theory Sea Floor Spreading Plate Tectonics GMC Santos San Beda College

Theory of Continental Drift by Alfred Wegener (1915) The continents where once part of a super continent or single landmass (Pangaea) that broke apart 200 M years ago and had drifted horizontally to their current location

It was observed by cartographers that the edges of the continental shelves in the Atlantic Ocean have similar shapes

Evidences for Continental Drift: Puzzle Edges of continental shelves almost fit together like pieces of a jig-saw puzzle

Evidences for Continental Drift: Fossil Records Fossils of Mesosaurus have been found in South America and Africa

Evidences for Continental Drift: Climate Clues Fossils of warm weather plants were found in Greenland Glacial deposits and grooved bedrock found in southern areas of South America, Africa, India and Australia

Evidences for Continental Drift: Rock Records Similar rock structures as found on different continents

Sea- floor Spreading Ocean floor had “mountains and valleys” similar to continents above water presence of ridges and valleys extending through the center of the Atlantic and other oceans of the world forming mountain ranges (mid-ocean ridges)