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Weathering and Erosion
Weathering is the process of breaking of rocks into smaller fragments by some natural agents such as wind, water etc. etc.
EROSION is the transport of rocks or broken fragments of rocks by natural agents of transport. Wind, water and ice act as agents of transport and shift rock fragments or sediments from one place to another.

Sea...Natures most effective agent of weathering and erosion
Sea waves splashing on the rocks along the shore line make a big impact on the rocks, shattering them down into small pieces over a period of time.
In the image to the right, the upper picture shows the big splash breaking over the rocks along the shore. In the lower picture a channel created in the rocks is seen very clearly.
This is one of my favorite images
Effect of sea, as an agent of weathering and erosion resulting in break down of big rock masses into small boulders and pebbles along the coast.
Wind erosion
Impact of strong wind also results in shattering of hard rocks into small pieces. Image to the right is from a desert in Al Ain area of Abu Dhabi emirate. Mr. Aizaz Usmani... a Geologist pointing to the eroded beds of limestone. Here erosion is enhanced by the desert climatic conditions where temperatures also play a big role in breaking down of rock. Daytime when temperature is very high, some times reaching up to 50 degrees, cause expansion of rock due to heat. At night, when temperature falls down, the rock body shrinks back. Though this expansion and shrinkage is very minor, but repeatation of this process over long period of time, makes rock weaker and weaker. When this rock is further subjected to wind impact, it causes rock to shatter into smaller pieces.

Effect of wind erosion on sand
Wind works as a strong agent of transport in the desert. Here sand blowing from the crest of the dune can be seen clearly in the picture. This way a dune moves forward and may travel across a desert......... AMAZING !!!!!!!!!
Another example of wind erosion
Image to the right is a good example of wind erosion. The softer part of the rock is eroded away leaving behind hard resistant part of the rock in the form of cliffs.
River....another effective agent of erosion
River at its young age that is near the source is very strong and it cuts down the soil and rock along its course. Picture to the right gives a good example of river erosion where big valleys are created due to strong flow of river water.

Man made erosion
Today man is the strongest agent of erosion!!!!!
No... It's not really.

You see several examples in your daily life. Cutting mountains and big rock bodies are common for road making, building construction and to make farmland etc.
Another example is mining for precious metals like gold, silver, copper etc., precious minerals like diamond, garnet etc and construction material like marble, granite etc.
Big source of man made weathering and erosion also comes from latest highly destructive weapons.