Question

the evidence that indicates there was once tectonic activity on mercury, venus, and mars

Answer 1

Mercury has no maria like the Moon, but billions of years ago lava flows formed intercrater plains. Mercury also has cliffs, called scarps, that are hundreds of kilometers long. Scarps have formed when Mercury's crust shrank and buckled as its interior cooled. 

Venus has more than a thousand large volcanoes and hundreds of thousands of smaller volcanic features. Most of the surface is covered with solidified lava flows. The larger volcanoes are often shielded volcanoes, similar to Earth's, which form from lava flowing up through the volcano's center. 

The tectonic features on Mars are the largest in the solar system: Olympus Mons and the Tharsis Ridge volcanoes dwarf Earth's volcanoes are the largest known in the Solar System. Olympus Mons is four times as high as the Mount Everest. Valles Marineris is a canyon on Mars that is deeper than the Grand Canyon and long enough to reach across the whole of the US. 

Answer 2

Tectonic is the structure present in the crust of the planet. The tectonic activity was seen once before on planets like mercury, mars, and venus.

What is the tectonic activity?

Tectonic activity is the structural component of Earth that controls the movement of the crust. Mercury had tectonic plates in its earlier period and as a result, formed cliffs known as scarps.

Earlier venus used to have large active volcanoes that covered the surface with solidified lava. They were similar to the volcanoes present on Earth.

The planet mars have the largest Tectonic features and volcanoes that are high and deep compared to the volcanoes present on Earth.

Therefore, the planets, mercury, venus, and mars once had tectonic plate movements.

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