Section Assessment

Section Summary

I Infiltration of water into the ground depends on the number of open pores.

I All the land area that drains into a stream system is the system's watershed.

I Elevated land areas called divides separate one watershed from another.

I A stream's load is the material the stream carries.

I Flooding occurs in small, localized areas as upstream floods or in large downstream floods.

Understand Main Ideas

1. manAnalyze ways in which moving water can carve a landscape.

2. Describe the three ways in which a stream carries its load.

3. Analyze the relationship between the carrying capacity of a stream and its discharge and velocity.

4. Determine why little water from runoff infiltrates the ground in areas with steep slopes.

Think Critically

5. Determine how a floodplain forms and why people live on floodplains.

6. Analyze how levees prevent flood damage.

«BOX» Earth Science

7. Design a data table that compares how silt, clay, sand, and large pebbles settle to the bottom of a stream as the velocity of water decreases.

Bctanc^p Self-Check Quiz

Bctanc^p Self-Check Quiz

Section 9.2


I Describe some of the physical features of stream development. I Describe the relationship between meanders and stream flow. I Explain the process of rejuvenation in the stream development.

Review Vocabulary abrasion: process of erosion in which windblown or waterborne particles, such as sand, scrape against rock surfaces or other materials and wear them away

New Vocabulary stream channel stream bank base level meander delta rejuvenation

Figure 9.11 The headward erosion of Stream A cuts into Stream B and draws away from its water into one stream.

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