I was OK last June when she said:
You may have noticed the outer layer of the Earth, the lithosphere, which is cool enough to behave as a more or less rigid shell has just moved?
Occasionally the hot asthenosphere of the Earth finds a weak place in the lithosphere to rise buoyantly as a plume, or hotspot. Don't be alarmed...........
It was the lithosphere that threw me - I missed the week we covered that but we did do "can I have 2 return tickets to Taxim Square" the following week

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