Structure of the Earth & History of Plate Tectonics

1. The study of the history of changes in the Earth's magnetic field-effectively confirmed the American geologist's theory (15)
4. Evidence of continental drift- a unique Permian fossil reptile (mesosaurus) only found in Southwest Africa and ..... (6)
6. The centre of the Earth (4)
7. The concept that the American geologist's evidence led to (3, 5, 9)

2. The original supercontinent (7)
3. In the 1950s, when nuclear submarines began to map the ocean floor with accuracy this was discovered, along with similar features, in seismically active regions (3, 8, 5)
5. The semi-liquid lower mantle the tectonic plates float on (13)
6. Evidence of continental drift- ..... found under Antarctic ice cap (4)
9. Evidence of continental drift- jisaw fit of South America and .... (6)
10. The widest section of the earth (2900km thick) (6)

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