Chapter 6 rivers and erosion review

Sinkholes can form when

• the water table rises due to flooding.

• rainwater containing carbon dioxide dissolves underground rock.

• minerals dripping from a cavern ceiling form stone pendants.

• streams drop sediment as they enter lakes.

Which of the following is a measure of a material’s ability to transmit fluids through interconnected pore spaces?

• competence

• permeability

• porosity

• capacity

One traditional flood control method has been to attempt to keep the stream’s flow within its channel by creating

• meanders.

• artificial levees.

• flood control dams.

• artificial cutoffs.

Occasionally, deposition causes curves in a stream to divide cut off into small curved ponds called

• deltas

• meanders.

• distributaries.

• oxbow lakes.

The capacity of a stream is directly related to its

• velocity.

• discharge.

• gradient.

• meandering.

The suspended load of a stream

• is deposited before the bed load.

• moves along the bottom of the channel by rolling or sliding.

• usually consists of fine sand, silt, and clay-sized particles.

• consists primarily of highly soluble substances.

Most streams carry the largest part of their load

• as dissolved material.

• in suspension.

• along the stream’s bottom.

• as bed load.

As stream discharge increases, which of the following occurs?

• Stream velocity decreases, but channel width and depth both increase.

• Stream velocity, channel width, and depth all increase.

• Stream velocity increases, but channel width and depth both decrease.

• Stream velocity, channel width, and depth all decrease.

Along straight stretches of a stream channel, the highest velocities of water are found in what part of the stream?

• along the stream bottom near the stream banks

• along the stream bottom in the center of the stream

• near the water surface along the stream banks

• near the water surface in the center of the stream

The ability of a stream to erode and transport material depends largely on its

• width.

• length.

• density.

• velocity.