Waves, tide, and wind dominate coastal processes and landforms. Rivers deliver sediment to the coast, where it can be reworked to form deltas, beaches, dunes, and barrier islands. The coastal zone is ...

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Weather also has an impact on the coastline. Rainwater can cause surface erosion and frost (in cold climates) can cause rock to shatter. Strong winds can also contribute to the erosion of cliffs.

At 4,130 miles (6,650 km) long, the Nile in Africa is the longest river in the world. Some people consider the Amazon in South America to be longer. This is because the many hundreds of channels that ...

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