How is erosion by water flowing in an alluvial stream different from that in a bedrock stream?
What will be an ideal response?
In an alluvial stream, loose particles already exist and are moved by the flowing water as long as the applied shear stress is sufficient to move the particles. In a bedrock stream, the particles have to first be produced. Abrasion of the bedrock by sediment particles transported in the flowing water is one erosional process. Plucking also occurs, when the shear stress of the flowing water is sufficient to dislodge pieces of bedrock that can be separated along fractures and bedding planes.
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The speed of light is slower in water than in air
a. true b. false
A liquid thermometer that is held in direct sunlight will ____
A) accurately measure the air temperature B) measure a much higher temperature than that of the air C) measure a much lower temperature than that of the air D) measure the temperature of the sun rather than the air
Which of he following are factors involved in climatic change?
A) variations in Solar Output B) changes in the Earth's Orbit C) changes in Atmospheric Turbidity D) all of these
Some farmers in the Midwest rotate their crops from year to year, switching from soybeans to corn on the same fields. What is one of the advantages of doing this?
A) Soybeans add large amounts of carbon dioxide to the soil, which helps the corn crop. B) Both crops require the same fertilizing supplies, so farmers save by buying fertilizer in bulk. C) Corn adds large amounts of phosphorus to the soil, which helps the soybean crop. D) The corn crop benefits from reactive nitrogen fixed and added to the soil by the soybean crop.