The correct answer is - underwater mountain ranges.
The mid-ocean ridges are actually underwater mountain ranges, which usually are very long, in fact the longest mountain range on Earth is created on the divergent boundary between the Eurasian and North American tectonic plates and between the African and South American tectonic plates. At the divergent tectonic boundaries we have the creation of new crust which rises from the mantle and fills in the gap between the tectonic plates. Because of the big amount of magma and high pressure, very big and long underwater mountain ranges are formed.
The theme is the writer's view of or comment about the subject. The answer to your question is D. I hope this is the answer that you are looking for and it comes to your help.
So Global warming is the rise in global temperatures due mainly to the increasing concentrations of greenhouse gases in the atmosphere.
Climate change is the increasing changes in the measures of climate over a long period of time.
This includes : precipitation, temperature, and wind patterns.
Hopes this helps :)
