51.   When the valley floor is covered with snow for long periods, Yakima becomes an ultimate collector of cold air.

52.   While he was down on the valley floor with a colleague, he noticed another blue item further afield.

53.   A winding road leads to the valley floor.

54.   Complicating matters further, these new dam projects have forced human populations to leave cultivated valley floors and resettle in the highland forests populated by wild elephants.

55.   For centuries, Machu Picchu was hidden from archeologists because the jungle-covered terraced ruins were not visible from the valley floor.

56.   For centuries, Machu Picchu was hidden from archaeologists because the jungle-covered terraced ruins were not visible from the valley floor.

57.   Shah said al-Qaida fighters were no longer in the cave complex and that his men controlled the valley floor.

58.   Sherali spoke just minutes before a tank rumbled past his car, turned onto the valley floor, and began pounding an enemy position in the distance.

59.   The al-Qaida members are scattered on valley floors, in fortified mountainside caves and along high ridges, he said.

60.   The cable car was on its way down Cermis mountain when it plunged to the valley floor, crushing everyone inside.