Runoff and Erosion Concepts

The video tutorial covers river erosion, starting with runoff, which is water flowing over the earth's surface. Runoff can originate from groundwater or precipitation. Factors affecting runoff include rainfall, soil permeability, slope, and vegetation. The video explains four types of erosion: rain splash, rill, gully, and sheet erosion. It also discusses river erosion, highlighting how meandering rivers erode banks and the concept of drainage basins, with examples like the Mississippi River basin.

What are the two primary sources of runoff?

• Groundwater and evaporation

• Groundwater and precipitation

• Precipitation and condensation

• Condensation and evaporation

How does soil permeability affect runoff?

• Less permeable soil decreases runoff

• More permeable soil decreases runoff

• More permeable soil increases runoff

• Soil permeability has no effect on runoff

Which factor does NOT affect runoff?

• Amount of rainfall

• Vegetation

• Soil permeability

• Wind speed

What type of erosion occurs when raindrops hit the ground and displace soil?

• Sheet erosion

• Rill erosion

• Gully erosion

• Rain splash erosion

Which type of erosion is characterized by water running off in sheets?

• Rain splash erosion

• Gully erosion

• Sheet erosion

• Rill erosion

Where does river erosion occur most rapidly in a straight river?

• Near the river source

• At the riverbed

• In the middle of the river

• At the riverbanks

How do meandering rivers primarily erode their banks?

• By eroding the riverbed

• By cutting into the inside banks

• By cutting into the outside banks

• By eroding the middle of the river

What pattern does stream erosion resemble in mountainous areas?

• Linear pattern

• Dendritic pattern

• Radial pattern

• Circular pattern

Which river basin is the largest in the United States?

• Amazon River Basin

• Mississippi River Basin

• Columbia River Basin

• Colorado River Basin

Where does the runoff from the Mississippi River Basin eventually flow into?

• Pacific Ocean

• Great Lakes

• Atlantic Ocean

• Gulf of Mexico