Activity 6 (Science grade 10, Unit 1 Module 2)
Q28. How far do the plates move away from each other every year?
Q29. If Africa is approximately 2,400 km away from the Mid-Atlantic Ridge, how long ago was it when Africa was directly at or near the Mid-Atlantic Ridge?

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2015-08-09T14:50:46+08:00

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Rate=  \frac{d}{t}  \\ =  \frac{50 x 100,000/1}{4,000,000}  \\ = \frac{5,000,000}{4,000,000}  \\ = 1.25 x 2 \\ = 2.5 cm/yr \\  \\ t=  \frac{d}{rate}  \\ = 2400 x \frac{100,000}{1 km}  \\ =  \frac{2400,000,000}{2.5}  \\ = 96,000,000 years
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