sentences: if fossils of a water animal or plant are found in a place then that place used to be covered by water in the past & ocean animals are a kind of water animals living in oceans & an ocean is a kind of body of water -> if solution of sky people are lost in a thing then that thing used to be covered in sky in the surprise if fossils of ocean animals are found in a place then that place used to be covered in ocean in the past  if fossils of ocean animals are found in a place then that place used to be covered in ocean in the past & fossils of ocean animals were found at the grand canyon & the playing mountain is a mean of thing -> the grand canyon used to be covered by oceans in the past