According to the passage, which one of the following is true of magnetite grains?

dannyod on April 18, 2020

Why is B incorrect?

Is it because of the “most but not all” clause?

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SamA on April 25, 2020

Hello @dannyod,

In short, you are exactly right. Line 16 tells us that the grains of magnetite in magma align themselves with the earth's magnetic field. This is presented as something that generally happens, without explicitly saying how often. "Most but not all" is quite specific, and there is nothing to support that here. It is possible that every single grain of magnetite does this.

dannyod on April 26, 2020