Planets that are closest to the sun are identified as.. ? , not sure if it’s 2 or 4

low density terrestrial

Explanation:

ans is 2

option 4 is correct

Explanation:

The inner four planets closest to the sun — Mercury, Venus, Earth and Mars — are often called the "terrestrial planets" because their surfaces are rocky.

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well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."