gcse aqa chemistry core science 2016 19th may

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chez01
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I don't understand the early atmosphere topic and the convection current, tectonic plates that topic

can somebody please explain it to me
thnx
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Joeyharrison99
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Early atmosphere:
Early Earth was mainly volcanoes, giving off gas and steam. As the gas built up, it began to block out the sun's light and cooling the earth. The cooling allowed water vapour to condense and for oceans. Oceans absorb CO2 as well as producing oxygen through photosynthesis of green plants. A build up of oxygen created the Ozone layer, allowing more complex organisms like humans to evolve.

Tectonic plates:
The Earth's crust is split into tectonic plates, which sit on the mantle. Radioactive decay in the mantle cause convection currents to occur in the mantle (due to less dense magma rising - not needed). The movement of magma causes the tectonic plates to move.
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Joeyharrison99
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(Original post by chez01)
I don't understand the early atmosphere topic and the convection current, tectonic plates that topic

can somebody please explain it to me
thnx
I posted below - didn't realise I wasn't directly replying. Sorry, hope that helps.
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siobhanx13
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(Original post by chez01)
I don't understand the early atmosphere topic and the convection current, tectonic plates that topic

can somebody please explain it to me
thnx
The early atmosphere stuff you need to know is:
1. Volcanoes gave out gases
The early atmosphere was probably mostly CO2 and virtually no oxygen
(water vapour and small amounts of methane and ammonia)

2. Oceans formed when water vapour condensed

3. Green Plants evolved and produced oxygen
Lots of CO2 dissolved into oceans
Plants took in CO2 and converted it into Oxygen during photosynthesis.

4. Ozone layer allows evolution of complex animals
Oxygen built up and killed off some early organisms but other organisms grew
Oxygen also created the ozone layer (O3) which blocks harmful rays from sun and more complex organisms to evolve

- Virtually no CO2 left now

I hope this helps, if you have any questions feel free to ask and I'll try my best to answer
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chez01
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(Original post by Joeyharrison99)
Early atmosphere:
Early Earth was mainly volcanoes, giving off gas and steam. As the gas built up, it began to block out the sun's light and cooling the earth. The cooling allowed water vapour to condense and for oceans. Oceans absorb CO2 as well as producing oxygen through photosynthesis of green plants. A build up of oxygen created the Ozone layer, allowing more complex organisms like humans to evolve.

Tectonic plates:
The Earth's crust is split into tectonic plates, which sit on the mantle. Radioactive decay in the mantle cause convection currents to occur in the mantle (due to less dense magma rising - not needed). The movement of magma causes the tectonic plates to move.
thankyou so much very well explained
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chez01
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(Original post by siobhanx13)
The early atmosphere stuff you need to know is:
1. Volcanoes gave out gases
The early atmosphere was probably mostly CO2 and virtually no oxygen
(water vapour and small amounts of methane and ammonia)

2. Oceans formed when water vapour condensed

3. Green Plants evolved and produced oxygen
Lots of CO2 dissolved into oceans
Plants took in CO2 and converted it into Oxygen during photosynthesis.

4. Ozone layer allows evolution of complex animals
Oxygen built up and killed off some early organisms but other organisms grew
Oxygen also created the ozone layer (O3) which blocks harmful rays from sun and more complex organisms to evolve

- Virtually no CO2 left now

I hope this helps, if you have any questions feel free to ask and I'll try my best to answer
(Original post by siobhanx13)
The early atmosphere stuff you need to know is:
1. Volcanoes gave out gases
The early atmosphere was probably mostly CO2 and virtually no oxygen
(water vapour and small amounts of methane and ammonia)

2. Oceans formed when water vapour condensed

3. Green Plants evolved and produced oxygen
Lots of CO2 dissolved into oceans
Plants took in CO2 and converted it into Oxygen during photosynthesis.

4. Ozone layer allows evolution of complex animals
Oxygen built up and killed off some early organisms but other organisms grew
Oxygen also created the ozone layer (O3) which blocks harmful rays from sun and more complex organisms to evolve

- Virtually no CO2 left now

I hope this helps, if you have any questions feel free to ask and I'll try my best to answer
thankyou so much i have another question ill juts pm you
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