Clil interrogazione
Argomenti:
Pangea
The rocks
Composition of hearth
4 Layers:
Plates tectonic
Crust
Mantel
Outher core
Inher core
The most external layer and the thinnest one (Arrond 70 kilometers thick onthe land (called continental crust) and arround 5 Km thick in the cocean floor
It is made up of rocks that consist primaliry of silica and alluminia
is the second layer of the hearth and also the largest one (3000 km thick) it's made up by slightly different silicate rock and mora magnesium and iron
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The Earth's outer core is made up of iron and nickel and is very hot (4400 to 5000
C°). It is so hot that the iron and nickel metals are liquid! The outer core is very
important to earth as it creates something called a magnetic field. This magnetic field
goes way out into space and makes a protective barrier around the earth that shields
us from the sun's damaging solar wind.
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The Earth's inner core is made up of iron and nickel, just like the outer core, but it is
different. The inner core is so deep within the earth that it's under huge pressure. The
pressure is so high that, even if it is so hot, it is solid. The inner core is the hottest
part of the Earth, and, at over 5000 C°, it is about as hot as the surface of the sun.
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Although we think of the land on Earth as fixed and stable, it is constantly
moving. This movement is so slow that we cannot notice it, in fact it only
moves between 2 and10 cm per year. It takes millions of years for the land to
move significantly.
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Major and Minor Tectonic Plates
Most of the Earth is covered by seven major plates and other minor plates.
The seven major plates include the African, Antarctic, Eurasian, North
American, South American, India-Australian, and the Pacific plates. Some of
the minor plates include the Arabian, Caribbean, Nazca, and Scotia plates.
There are 3 different type of bundaires
Convergent
Divergent
Transform
Sometimes one plate will move under the other.
two plates are getting pushed apart.
two plates slide past each other.
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The Earth is in continuous activity and the energy inside the Earth causes
phenomena that can be destructive (earthquakes) and change the Earth’s
surface like the movements of continents.
The scientist Alfred Wegener (1880-1930) observed that the
shapes of continents were complementary,
Thanks to some of his observations he presented the theory of continental
drift: 250 million years ago all the land masses were joined together in one
big continent: Pangea, surrounded by one big ocean, Panthalassa
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Wegener had four types of evidence for his theory:
1) Geographic evidence: the complementary shapes of the continents
2) Paleontological evidence: fossils show that the same species lived in
fa-away lands
3) Geological evidence: the rock layers of some continents very far from
each other are the same
4) Climatologic evidence: all the sedimentary rocks formed 200 million
years ago in the southern continents are of glacial origin
There are three major types of rocks: Metamorphic, Igneous, and Sedimentary.
Metamorphic rocks are formed by great heat and pressure.
Igneous rocks are formed by volcanoes.
Sedimentary rocks are formed by years and years of
sediment compacting together and becoming hard