PLATE TECTONICS

CONTRIBUTION: ALFRED W.

• In 1912 Alfred tried to figure out why animal & plant fossils
• on different continents.

EVIDENCE: ALFRED W.

• In 1915 A map of the continents showed
• the jigsaw fit of Africa's and S. America's shorelines.

ACCEPTANCE: ALFRED W.

• Alfred was not accepted by the scientific community.

CONTRIBUTION: ABRAHAM O.

• In 1956 Abraham had a theory that the continents were all once
• connected and then they all moved apart die to earthquakes and floods.

EVIDENCE: ABRAHAM O.

• Due to the "jigsaw fit of the continents and the volcanic
• process in the oceanic area where basalt come out onto the
• sea floor, forcing plates to separate Ortelius found his
• evidence.

ACCEPTANCE: ABRAHAM O.

• Abraham was not accepted by the scientific community but
• Alfred Wegener came back with more evidence to support his
• theory.

CONTRIBUTION: HARRY HESS

• In the 1930s Harry had a theory that molten rock comes up from
• Earth's interior along the mid-ocean ridges, making new sea floor that
• spreads away from the active ridge crest and, eventually, sinks
• into the deep oceanic trenches.

EVIDENCE: HARRY HESS

• In 1963 The Vinen-Matthews exploration and
• oceanic exploration during the years later his theory
• confirmed Hess' argument.

ACCEPTANCE: HARRY HESS

• The scientific community was skeptical of
• his ideas.

DEFINITIONS: ALFRED & ABRAHAM

• Continental Drift: theory stating that Earth's continents were
• once together and moved away.
• Pangaea: the supercontinent that included all the continents.
• Plate: Tectonics: A plateau is high, flat ground or a
• situation where something has stalled that was moving forward.

DEFINITIONS: HARRY HESS

• Mid-ocean ridges: a series of mountain ranges on the ocean floor.
• Sea-floor spreading: the theory of new oceanic crust formed by upwelling
• magma at mid-ocean ridges.
• Plate Tectonics: a plateau is high, flat ground or a situation where something has stalled
• That was moving forward.