formation of earth’s continents
DESCRIPTION
Formation of Earth’s Continents. FORMATION OF EARTH’S CONTINENTS. SCIENTIFIC NON-SCIENTIFIC. WHAT IS A CONTINENT. Continent comes from the word ( continere , Latin for “to hold together”), a derivation that implies a structural unity, though not necessarily dry land. - PowerPoint PPT PresentationTRANSCRIPT
Formation of Earth’s
Continents
SCIENTIFIC
NON-SCIENTIFIC
FORMATION OF EARTH’S CONTINENTS
Continent comes from the word (continere, Latin for “to hold together”), a derivation that implies a structural unity, though not necessarily dry land.
A large mass, as a distinct from an island, which is smaller landmass surrounded by water.
WHAT IS A CONTINENT
Australia EuropeAntarctica South AmericaNorth America Africa Asia
7 continents
THE EARTH’S INTERIOR
SCIENTIFIC FORMATION OF EARTH’S CONTINENT
SHRINKING EARTH
The Scientist said that the Earth cooled from its original molten state.
The cooling process caused the Earth to shrink as it hardened.
SHRINKING EARTH
SCIENTIFIC FORMATION OF EARTH’S CONTINENT
DRIFTING CONTINEN
TS
Over the years a new description of earth’s surface---one that suggested that the continents were actually moving and changing---developed.
One of the first proponent of this idea was..
DRIFTING CONTINENTS
FRANCIS BACON17th Century Scientist
ANTONIO SNIDER-PELLIGRINI1858
ALFRED WEGENER1912
CONTINENTAL DRIFT THEORY
SCIENTIFIC FORMATION OF EARTH’S CONTINENT
CONTINENTAL DRIFT THEORY
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From the Greek word pan, meaning all, and ge, meaning Earth.
PANGEA
LAURASIA(Northern HEMISPHERE)
GONDWANALAND(Southern hemisphere)
TWO HUGE CONTINENTS
North America
Europe AsiaGreenland
LAURASIA
AfricaSouth AmericaAntarcticaAustraliaIndia
Gondwanaland
PLATE TECTONIC
S
SCIENTIFIC FORMATION OF EARTH’S CONTINENT
Revolutionized scientific thinking about the earth and showed that continental drift may, in fact, occur.
In 1950’s scientist began studying ocean floor in more detail than ever before. Speacial sonar(SOH-nar) equipment that uses sound waves to detect underwater objects helped scientist gather information.
Plate Tectonics
LITHOSPHEREEludicates the outermost layer.
ATHENOSPEHERE Is where the plates slide over the Earth’s mantle.
CONTINENTAL
OCEANIC
PLATES
LITHOSPERIC plates, slowly moves in different directions.
Relative motion of plates w/ respect to adjacent places
DIVERGENT MARGIN
CONVERGENT MARGIN
SHEAR
MOVEMENT
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Watch Video
This is an example of a divergent plate boundary (where the plates move away from each other). The Atlantic Ocean was created by this process. The mid-Atlantic Ridge is an area where new sea floor is being created.
As the rift valley expands two continental plates have been constructed from the original one. The molten rock continues to push the crust apart creating new crust as it does.
As the rift valley expands, water collects forming a sea. The Mid-Atlantic Ridge is now 2,000 metres above the adjacent sea floor, which is at a depth of about 6,000 metres below sea level
The sea floor continues to spread and the plates get bigger and bigger. This process can be seen all over the world and produces about 17 square kilometres of new plate every year.
SUBDUCTION
NOTE:The key to subduction seems to be water which acts as a kind of lubricant as the heavier plate slips underneath the lighter plate.
CONVERGENT
EXAMPLE (Convergent)
The Himalayas and Mount Everest
In some regions two lithospheric platesslide past one another in opposite directions,without converging or diverging. Such platemargins are called shear margins. As a resultof this, these regions have developed intozones of faulting or shearing . The San AndreasFault Zone of California is an example ofsuch a plate margin. Shear margins are zonesof tectonic activity characterized by frequentearthquakes. Some regions of the Earth arelocalities where three lithospheric plate marginsmeet together. Such plate margins are called‘triple junctions’.
Antonio Snider, who in 1859 first proposed horizontal movement of continents catastrophically during the Genesis flood. The statements inside Genesis 1:9-10 about the gathering together of the seas in one place, which implies there was one landmass, influenced his thinking.
NON SCIENTIFIC
The gods shook the Earth and moved the continents with heavy metal (Thunder and rock).
Giants
Asteroids
Ocean and sky (Dagat at langit)
NON SCIENTIFIC