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Is the Earth the only planet in the solar system known to have plate tectonics?

Answer 1

Emma Arguello

It was true before but no longer true now. Plate tectonics have been discovered on Mars.

It was discovered at UCLA:

UCLA scientist discovers plate 237303, according to newsroom.ucla.edu.

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Answer 2
Joseph Allen
No, Earth is not the only planet in our solar system with plate tectonics. There are other planets as well. Recent research indicates that Mars may have had plate tectonics in its early history, though not as active as Earth's. Scientists also believe that Venus has some form of tectonic activity, though they disagree on exactly what kind.
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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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