yes it is flat
A meadow
it mostly has rocky land
a plateau is an area of mostly high, flat land that is raised above nearby land.
A plateau
Valley
No, Philadelphia is mostly flat land. There aren't many near it either.
planes
plateau
Orlando, Florida is mostly flat with very few hills. The terrain is generally low-lying and characterized by its flat topography.
About 20% of Japan's land is flat. This is because it is a chain of volcanic islands (like Hawaii) making it mostly mountainous.
It depends where in Ohio you are talking about. The area around Lake Erie is mostly flat. The Eastern regions of Ohio are technically parts of Applachia and mountainous. The Central portion is mostly flat plains, Western Ohio has varying terrain.
No. It has it all: from steep mountains to hilly terrain to flat lands.