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Changes to the Earth and its atmosphere
The Earth has a layered structure, including the core, mantle and crust. The crust and Comment [M1]: The Core is the
innermost part of the Earth.
upper mantle are cracked into large pieces called tectonic plates. These plates move slowly, but
Comment [M2]:…

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The plates move because of convection currents in the Earth's mantle. These are driven by
the heat produced by the decay of radioactive elements and heat left over from the formation of the
Earth.
Where the tectonic plates meet, Earth's crust becomes unstable as the plates push against
each other,…

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It is clear that the main gas is nitrogen. Oxygen- the gas that allows animals and plants to
respire, and fuels to burn- is the next most abundant gas. These two gases are both elements and Comment [M4]: To engage in
respiration- the energy- producing
account for about 99% of…

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The main uses of the noble gases
Noble Gas Main Use
Helium Used in balloons and airships. It is much less
dense than air, so balloons filled with it float
upwards.




Helium balloons
Neon Used in advertising signs, it glows when
electricity is passed through it. Different
coloured neon lights…

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The early atmosphere:-
Scientists believe that the Earth was formed about 4.5 billion years ago. Its early
atmosphere was probably formed from the gases given out by volcanoes. It is believed that there
was intense volcanic activity for the first billion years of the Earth's existence.
The early atmosphere was…

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