Limestone.
Valley is a noun. But it is used as an 'adjunct' or adjective to describe things in or about a valley: valley floor, valley streams, valley residents.
because a space man crashed into it:]
A fjord is a valley whose characteristic shape was created by a glacier, so it is a valley after it was glaciated.
Australia has no continental glaciers, because the mountains do not receive sufficient snowfall to form them (at least not in the present era).
rift valley
limestone and dolomite bedrock, which are easily dissolved by water, forming caves and caverns in the Valley and Ridge province of Virginia. The acidic groundwater slowly dissolves the carbonate rocks over time, creating underground cavities and networks of caves.
Rift Valley Province's population is 10,006,805.
The area of Rift Valley Province is 182,413 square kilometers.
Great Valley
Cordova is a province in Spain. Compostela Valley is a province in the Philippines.
Benedict Arnold who at that time was serving as a Brigadier General in the British Army.
The smallest province in Region 11, Philippines is Compostela Valley.
The Huang He Valley is located in northern China, and it follows the path of the Yellow River. It extends from the Qinghai province in the west to the Shandong province in the east.
Sangin Valley, of Helman Province.
British Columbia
Compostella Valley is a province in the Philippines. See link below for more information
Province, Kenya