16 Questions
What does hydrology study?
The occurrence and circulation of water
What percentage of water on Earth is fresh water?
3%
What is the portion of precipitation that appears in the surface streams called?
Runoff
Where does about 97% of water on Earth occur?
As saline water in seas and oceans
What is the only chemical compound that occurs in normal conditions as a solid, a liquid, and a gas?
Water
What represents only about 0.3% of really mobile fresh water?
The flow that contributes to rainfall, evaporation, and stream flow
What is the common unit used to express runoff?
Cumec
How is runoff from different drainage basins commonly compared?
Cumec per square kilometer
What is the particularly useful unit for comparing runoff rate or volume with precipitation?
Millimeters per day
What term is used to describe the movement of water, in the three phases of gas, liquid, and solid, from the ocean, land, or living matter into the atmosphere?
Hydrological cycle
What process refers to the abstraction of precipitation by seeping into the soil below the ground surface?
Infiltration
What factor does infiltration rate depend on?
Vegetative cover
What is the storage effects of the surface layers of the earth responsible for?
Reducing runoff
How is precipitation almost invariably expressed?
Millimeters per day
What is the single strongest variable driving hydrologic processes?
Precipitation
What phenomenon causes some water vapor in the atmosphere to turn into liquid or ice (snow)?
Condensation process
Test your knowledge of hydrology, the science dealing with the occurrence, distribution, and circulation of Earth's waters, their properties, and their interaction with the environment.
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