The correct answer is - D. volcanic eruptions.
In recent studies and research about the water on our planet and how it came to be, the scientists managed to find new evidence that suggest that not only the comets and asteroids contributed to the existence of water on our planet, but also the volcanoes.
The volcanoes are actually releasing into the atmosphere the material from the deeper part of the Earth, the mantle layer. The mantle layer, as it turns out, has water in its rocks, so through the volcanic eruptions, that were much more and much bigger in the distant past, that water got released into the atmosphere. From the atmosphere, that water was falling on the surface, thus contributing to the creation of the first oceans on Earth.
Is this a multiple choice or what? i think a if it is
Correct Option is D). Burial type/form of metamorphism has a tendency to arise in areas wherein large quantities of sedimentary or volcanic substances gather in a subsiding basin, pushing older rocks similarly into the interior.
Burial metamorphism happens while sediments are buried deeply sufficient that the warmth and strain purpose minerals to start to recrystallize and new minerals to grow, however does now no longer depart the rock with a foliated appearance. As metamorphic strategies go, burial metamorphism takes location at notably low temperatures (up to ~300 °C) and pressures (100s of m depth). To the unaided eye, metamorphic modifications might not be obvious at all.
Regional metamorphism refers to large-scale metamorphism, together with what occurs to continental crust alongside convergent tectonic margins (wherein plates collide). The collisions bring about the formation of lengthy mountain ranges, like the ones alongside the western coast of North America.
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