Relation between weathering and erosion:

Weathering

Erosion

It is the decomposition of rock ,soil and minerals by direct contact with the atmosphere.

It is the displacement of solid by wind ,water and ice.

The weathered materials are not displaced.

The eroded materials are displaced.

The different types of weathering include physical, chemical and biological weathering.

The different types of erosion are water wind, ice, thermal and gravity erosion.

Weathering is caused due to atmospheric factor like air pressure.

Wind, water, ice and human activities are some of the cause of erosion.

What are the factor that effect the Runoff?

Ans:

1.soil type: Permeable soil minimum runoff (sand ,gravel, silt, clay)

2.Rainfall intensity : Maximum rainfall Precipitation create maximum runoff .Minimum rainfall create minimum amount of runoff or discharge. 

3.Types of Precipitation : Precipitation generally occurs in the form of rain or snow. Rain produces immediate runoff and snow produces runoff at a slower rate.

4.Verious climatological factor: Temperature, wind, humidity  etc. Factors are effect runoff. 

5.Duration of rainfall : For longer duration rainfall runoff is increase. For minimum   duration rainfall, Runoff is decrease. 

6.Distribution of rainfall: if rainfall duration is 2hr for a small area and a large area. Then we find maximum runoff for small area and minimum runoff for large area.

7.Soil moisture deficiency :The runoff depends on the soil moisture. If rain occur after a long dry spell of time, the soil is dry and it can absorb huge amount of water and and thus intense rain after may fail to produce appreciable runoff. On the otherhand, if the rainfalls after a rainy season, the soil will already be wet and there will be less infiltration and even small rainfall may cause appreciable runoff. 

8.Distribution of rainfall : If rainfall duration is 2hr for a small area.Then we find maximum runoff for small area find maximum runoff for large area.

9.Soil moisture deficiency : The runoff depends on the soil moisture present at the time of rainfall. If rain occurs after a long dry spell of time, the soil is dry and it can absorb huge amount of water & thus intense rain after may fail to Produce appreciable runoff.