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Which of the following is NOT a key economic question?
River's Flow
The movement of water in a river channel as it travels from the headwaters to the mouth, influenced by gravity and landscape.
Gravity
The force that attracts a body towards the center of the earth, or towards any other physical body having mass, playing a key role in the movement and deformation of the Earth's crust.
Sediment Load
The amount of sediment, including material chemically dissolved in a solution, carried by a stream.
Clasts
Rock fragments or grains that are cemented together in a sedimentary rock.
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