Answer:
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Explanation:
The most logical choice to complete the text is:
(Choice A) high silica concentrations on Mars likely formed from a different process than that which formed the crusts of other planets.
Explanation:
1. The text mentions that the crust of Mars was thought to be mainly composed of basalt due to intense volcanic activity and the cooling of a magma ocean.
2. A study led by Valerie Payré discovered high concentrations of silica in certain regions on Mars, which is unusual for a planetary surface formed in a basaltic environment.
3. Since a basaltic environment is unlikely to contain large amounts of silica, Payré concluded that the high silica concentrations on Mars likely formed from a different process compared to the formation of crusts on other planets.
4. This conclusion suggests that the presence of silica on Mars may have a unique origin or geological history, distinct from other planets.
Therefore, Choice A is the most logical completion of the text as it aligns with Payré's conclusion based on the data analysis of silica concentrations on Mars.