Why do deltas oo-oop?

How wide is the river severn at source? What are the danger if someone falls into a crevasse? How does the wind and sand make work or archaeologists difficult? What were the boats called that immigrentds took to Ellis island? What is the name of the salt lake located on the border between Israel and Jordan? Who studies how a nomadic tribe survives in the harsh climate of the Sahara Desert? Which two countries are linked by the passage called the chunnel in Europe? Do the Appalachian muontains which are located in the eastern part of the us run mainly east and west or north and south? What is the length of the river brue? Which statue from Florida is located in statuary hall and what did he invent? What is the climax of through the tunnel? What is weather like in the forbidden city? Why is there a large lake on the Nile River in Southern Egypt? Is the grate basin man made or natural feature? How are lakes classified? How often will a weasel give birth? Areas of North America that are far from the oceans are prone to what kind of climate? Why was the sloth named sloth? Did people get paid for building pyramids? How much did Parthenon cost?