Grass and Leaves are parts of plants, and would be the area of study for a Botanist (sometimes known as a plant biologist).
An ecologist studies ecosystems, which includes the interactions between organisms and their environment. They examine factors like species diversity, nutrient cycling, and energy flow within ecosystems to better understand how they function and respond to disturbances.
A mineralogist is a scientist who specializes in the study of minerals, their properties, composition, and distribution in nature. They examine the formation, classification, and identification of minerals found on Earth.
A geochemist or environmental scientist would study the effects of acid rain on marble statues. They would investigate how the chemical composition of the rain interacts with the marble, leading to erosion and discoloration.
A hydrogeochemist studies the movement and quality of water on Earth, including its interactions with rocks and minerals. They analyze the chemical composition of water and how it changes as it moves through the environment, helping to understand processes like weathering, groundwater contamination, and nutrient cycling.
A geographer or geoscientist is the type of scientist who makes maps of the Earth. They study the Earth's surface and its features to create accurate representations of locations, landscapes, and environments.
Botanists
An ecologist studies pollution
A mineralogist studies minerals.
The kind of scientist who studies Urology would be a Biologist, since Urology concerns a biological function (urination). If you mean the kind of doctor who studies Urology, that would be a Urologist.
meteoroligists
Audiologist
An Ichthyologist.
A zoologist.
Botanist
seismologist
a biologist
cosmologists