1.9 The rock cycle

As you are reading this, rocks are being formed and destroyed on the Earth. Rocks are being heated and squeezed to form new metamorphic rocks; other rocks are melting to form magmas, which eventually cool and solidify as new igneous rocks; and the processes of weathering, erosion, transport and deposition are generating new sediments. The continuous action of rock-forming processes means that (given time) any rock in the Earth's crust will become transformed into new types of rock and that th
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15 Appendix: multiplication tables

If you want to be able to do division without using a calculator, you need to know by heart what you get if you multiply any two numbers up to 10. All the possible combinations can be shown in a multiplication table (also called a times table), like the one below.

Figure 37
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7.4 Elixirs of the nervous system: neurotrophins

According to Section 7.2 axons obtain an elixir from targets at their synapses.

Confirmation that there is indeed an elixir came from a series of events that reveals how much of science really works. Elmer Bucker, working with Hamburger in the mid-1940s, had removed a limb bud from a chick and replaced it with a tumour from
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References

Lewis, G. and Phoenix, A. (2004) ‘Race ‘ethnicity’ and identity’ in Questioning Identity, K. Woodward (ed.), London, Routledge/The Open University.
The Runnymede Bulletin (1999) ‘Black deaths in police custody’, no.319, September, pp.8–9.
Sardar, Z., Ravetz, J. and Van Loon, B. (1999) Introducing Mathematics, Cambridge, Icon Books.

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