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Hydrology is the study of the Earth's water. Hydrology includes geohydrology, limnology, oceanography, chemical oceanography, physical oceanography, biological oceanography, geological oceanography and paleoceanography, amongst other Earth Sciences.
I am assuming that you meant 'If Earth's magnetic field collapsed for a few seconds' If that's the case then nothing much would happen here on Earth. But if it collapsed for a long time, the Earth would loose it's atmosphere and every living thing on Earth would die. If you are really asking what would happen if the Earth's gravitational field collapsed, then we would be floating around in the air and then come, hopefully, back gently on land again.
Oceanography is important because the ocean is an important part of the eco-system. It is important to learn about the animals in the ocean. It is also important to track changes in the ocean since these changes can impact the entire Earth.
The planet Mars is smaller than Earth and has a weaker gravitational field. As a result, people on Mars would weigh less than they do on Earth.
A magnetic field would deflect both alpha and beta particles, as would a charged electric field.
Your career preference is the career field in which you prefer. For example, if you prefer to be a teacher as a profession, then that would be your career preference.
The term career field refers to the industry that a career is in. For example, people could be in the medical career field. This is not their actual job title. Their job title would be specific to their duties such as doctor, nurse, dentist, or speech language pathologist.
they will be extinct
You would then have an insulator immersed in an electric field. Nothing would happen.
The field would become all wet a sloshy this is called -------
To become an oceanographer, you will need to obtain either a masters or doctorate degree in oceanography. It is possible to obtain a bachelors degree however it would lead to entry level positions in the field.
A good career field to look into would be forensic psychology. As found on many shows this job field is growing.
Choose the one that fits you best and has reasonable salary.
A career subfield is a specialized area within a larger field or industry that focuses on a specific aspect or topic. For example, within the field of healthcare, a career subfield could be pediatric nursing or radiology. These subfields allow professionals to develop expertise and skills in a specific area of interest.
Field mice do not have an "economy". An "economy" is a human invention.
Oceanography.
That would be Oceanography I believe.