One recent scientist known for studying ecosystems is Dr. Leandro Castello, an aquatic ecologist who focuses on freshwater ecosystems and their conservation and management.
geologist
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A seismologist. Names, I'm not so good at.
A geologist or a avalanche specialist studies the amazing snow hazards called avalanches...
A scientist who studies volcanoes is called a volcanologist. They specialize in understanding the processes and behavior of volcanoes, including predicting eruptions and studying the impact of volcanic activity on the environment.
The name of a scientist that studies sports is called a sports scientist.
An arachnologist
A virologist is a scientist who studies viruses.
A scientist who studies animals is called a zoologist.
A scientist who studies radioactivity is called a nuclear physicist or a radiologist.
A scientist who studies animal life is a zoologist. There is no particular name for a scientist that specialises in platypuses.
The name for this type of scientist is a teuthologist
A scientist who studies soil is called a pedologist. Pedologists study soil composition, classification, and the processes that affect soil formation, such as weathering and erosion. Their research is important for understanding how soil supports plant growth, sustains ecosystems, and interacts with the environment.
Marine biologist. Actually, a Marine Biologist is someone who studies marine organisms (plants, oceans, and animals), but someone who studies MAINLY marine mammals is a marine mammalogist.
This answer is a entomologistA scientist who only studies fish is called an ichthyologist.
Astronomer
environmentalist