The two population characteristics of most interest to researchers are 
and The two population characteristics of most interest to researchers.
Definitions:
Sediment
Particles of rock and mineral debris that have been transported and deposited by wind, water, or ice.
Terminus
The lower end of a glacier.
Evaporation
The process by which water transforms from a liquid to a gas or vapor, often driven by heat from the sun.
Seawater
The saltwater that makes up the oceans and seas, covering more than 70% of the Earth's surface.
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