One: They are a type of Sedimentary rocks. They were formed by sticking together grains and sand. Then the lake, river etc got some water on the flat sandstone hills of the US rocks. They stuck together. That is how sandstone rocks are made.
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The Sand Hills region in Nebraska is characterized by large sand dunes and grass-covered rolling hills. While there are some flat areas, the defining feature of the region is the unique dune formations that cover much of the landscape.
Orlando, Florida is mostly flat with very few hills. The terrain is generally low-lying and characterized by its flat topography.
No, Liverpool is not flat. The city is hilly in some areas, especially around the River Mersey and parts of the city centre.
They are flat and have low vegetation.
Alabama is characterized by rolling hills and flat terrain, with the northern part of the state containing more hills and the southern portion being flatter. Overall, Alabama's landscape is diverse, featuring mountains in the northeast, plains in the central region, and coastal areas in the south.