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L is for ... limestone!

Limestone is a sedimentary rock. It is made up of thousands of fossil sea creatures - shells, corals or, in this case, crinoids (sea lilies).

Question: Limestones often form in tropical seas where coral can grow. The fact that we find limestone in Britain means that Britain was once:

a. Much warmer
b. The same temperature
c. Much colder

Limestone

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