Which of the following was not abundant in the early atmosphere?

What percent of Earth’s volcanic activity, each year, takes place on the seafloor?

Fast-moving spreading zones tend to be more gently sloping than slow-moving ridges.

Deep-sea trenches are found at convergent plate boundaries.

Extending from the base of the continental rises into the deep-ocean basins are flat depositional surfaces called ________.

Which is closest to the continental margin?

Which layer of the Earth behaves in a plastic manner?

volcanoes on the seafloor that are flat-topped because of wave erosion are called:

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Who was the first person to advance the idea of mobile continents in 1912?