Science Revision
DANGER ZONE
Note:
Magma= Molten rock
Mantle= layer beneath crust
Natural disasters: Volcano eruption, tornado, hurricane
➔ Natural disaster such as volcanic eruptions, earthquakes and tsunamis are
caused by movement in the earth's crust
Man made: nuclear explosion, extreme transportation accidents, some bushfires
Continental Drift theory (historical timeline)
1596 by the Dutch map maker Abraham Ortelius, suggested that the Americas,
Eurasia and Africa were once joined and have since drifted apart "by earthquakes
and floods", creating the modern Atlantic Ocean. Ortelius relied on the fact that the
coastlines of the continents he mentioned seemed to fit together like the pieces of a
huge jigsaw puzzle.
Alfred Wegener was the first to use the phrase "continental drift" and formally
publish the hypothesis that the continents which were once joined had somehow
"drifted" apart. Wegener had introduced his theory in 1912 at a meeting of the
German Geological Association. His paper was published that year and expanded
into a book in 1915. One of the main problems with Wegener's theory was that he
believed that the continents "plowed" through the rocks of the ocean basins. Most
geologists did not believe that this could be possible. In fact, the biggest objection
to Wegener was that he did not have an acceptable theory of the forces that
caused the continents to drift.
● The Theory of Continental Drift was proposed by Alfred Wegner.
● Alfred Wegner was a German scientist who proposed his theory of Continental
Drift in 1912.
● His theory was rejected at the time and was only accepted in the 1950’s
Alfred Wegner suggested that all the continents were once joined together to form a
supercontinent called Pangaea . The theory states that over time the continents drifted
apart . they were first broken into to 2 major land masses called:
Laurasia: North america, Europe & Asia
Gondwana: 7 continents + indian subcontinent
Plate tectonic theory: States that the earth's crust is broken into large pieces called
tectonic plates. Edges of plates called plate boundaries. Plates move against each other
due to magma moving around the mantle. At plate boundaries volcanoes and
earthquakes are found.
DANGER ZONE
Note:
Magma= Molten rock
Mantle= layer beneath crust
Natural disasters: Volcano eruption, tornado, hurricane
➔ Natural disaster such as volcanic eruptions, earthquakes and tsunamis are
caused by movement in the earth's crust
Man made: nuclear explosion, extreme transportation accidents, some bushfires
Continental Drift theory (historical timeline)
1596 by the Dutch map maker Abraham Ortelius, suggested that the Americas,
Eurasia and Africa were once joined and have since drifted apart "by earthquakes
and floods", creating the modern Atlantic Ocean. Ortelius relied on the fact that the
coastlines of the continents he mentioned seemed to fit together like the pieces of a
huge jigsaw puzzle.
Alfred Wegener was the first to use the phrase "continental drift" and formally
publish the hypothesis that the continents which were once joined had somehow
"drifted" apart. Wegener had introduced his theory in 1912 at a meeting of the
German Geological Association. His paper was published that year and expanded
into a book in 1915. One of the main problems with Wegener's theory was that he
believed that the continents "plowed" through the rocks of the ocean basins. Most
geologists did not believe that this could be possible. In fact, the biggest objection
to Wegener was that he did not have an acceptable theory of the forces that
caused the continents to drift.
● The Theory of Continental Drift was proposed by Alfred Wegner.
● Alfred Wegner was a German scientist who proposed his theory of Continental
Drift in 1912.
● His theory was rejected at the time and was only accepted in the 1950’s
Alfred Wegner suggested that all the continents were once joined together to form a
supercontinent called Pangaea . The theory states that over time the continents drifted
apart . they were first broken into to 2 major land masses called:
Laurasia: North america, Europe & Asia
Gondwana: 7 continents + indian subcontinent
Plate tectonic theory: States that the earth's crust is broken into large pieces called
tectonic plates. Edges of plates called plate boundaries. Plates move against each other
due to magma moving around the mantle. At plate boundaries volcanoes and
earthquakes are found.
