And this one..what features are evidence of the pacific ocean's maturity?

The features that are evident of the Pacific Ocean's maturity are its ridges and trenches.

Explanation:

The Pacific Ocean is the biggest and the oldest ocean on the planet. The existence of huge ridges and deep trenches in this ocean are evident of its maturity. The ridges are a result of prolonged and consistent elevation of oceanic plates and volcanic eruptions under the water for millions of years. The trenches also take a long span of time for their formation and deepening. Thus, the existence of huge ridges and deep trenches prove the maturity of the Pacific Ocean.

Answertaurus is the highest in the sky;