Answer: Silt, Sand and Gravel
Explanation:
When rock wears out due to process of weathering, it breaks down into pieces or sediments that ranges from microscopic grains to very large grains. Now,
Sediment smaller than 0.0625 mm in diameter cannot be seen unaided and is called Silt
Sediment between 0.0625 and 2 mm in diameter generally is known as Sand which refers to collection of fine, medium, and coarse sand.
Grains larger than 2 mm are called Gravel and range from 2 mm up to 64 mm.
The international conference on population and development was held in Cairo, Egypt in 1994.
