Iwant to learn about the deep blue oceans. how do their currents move? what lies on the seafloor? how does the marine life live? i want to study

The correct answer for the blank is - Oceanography.

Oceanography ( also known as oceanology) can be described as the study of all aspects of ocean that includes physical, biological, and chemical properties.

It is a part of earth science, which covers a large range of areas, including ecosystem dynamics; waves, ocean currents, geology of seafloor etc.

In the question, the subject wants to learn about the deep blue oceans, thus, he wants to study oceanography.

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.