Eypts land and climate

Eypt is a large country that is about the same size as Texas

ERG

an erg is a huge area of shifting sand dunes in the Sahara. An erg in a broad, flat area of desert covered with wind swept sand with no vegetative cover. The term takes its name from the Arabic word arq meaning "dune field"

WHAT IS SILT?

Silt is small particles of rich soil. Silt is also material of a size somewhere between sand and clay whose mineral orgin is Quartz and feldspar. Silt may occur as a soil or as sediment mixed in suspension with water (also known as a suspended load) in a body of water such as a river.
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Eypts land

When the silt reached Egypt, the Nile flooded its banks. As the floodwaters withdrew, the silt was left behind, making the land better for farming. Silt may occur as a soil or as sediment mixed in suspension with water (also know as a suspension load).
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What is Wadi?

Wadi is a valley, ravine, or channel that is dry except in the rainy season. A riverbed that contains water only during times of heavy rain or simply an intermittent stream. Wadi's tend to be associated with centers of human population because sub-surface water is sometimes available in them.