Rivers

1. part

1.1. youth

1.1.1. small

1.1.2. fast

1.2. maturity

1.2.1. large

1.2.2. quick

1.3. old age

1.3.1. very large

1.3.2. slow

2. erosion

2.1. hydraulic action

2.2. abrasion

2.3. attrition

2.4. solution

3. deposition

3.1. traction

3.2. saltation

3.3. suspension

3.4. solution

4. how rivers affect humans positively

4.1. tourism

4.2. fishing

4.3. crops and settlements

4.4. transport

5. how rivers affect humans negatively

5.1. flooding

5.2. eroding