6 a) 11.5.2 Expand the ideas into sentences.
1 concept/base on/simple physics
The concept is based on simple physics.
2 require/crane/120 metres tall/six arms/and/concrete blocks/weigh/35 tons each
system/control/innovative/software
3
4 electricity
demand/decrease/crane/use/surplus
power/build tower of blocks
5 demand/increase/crane/lower blocks/use gravity
6 potential energy/in blocks/convert/electricity/by
turbine

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