How deep should a trench be without shoring?

On which continent is the Antarctic Desert located? Who is Universal Studios external auditor? Which river flows from the shaba plateau north then west then southwest through most of the country Zaire? What size shoe does the statue of liberty wear? What describe the shape of the mid Atlantic ridge? What are the Grand Tetons an example of what mountains? Why was the matterhorn mountain famous? Where do coatimundi live? Describe the definition of lean with regrads to quality in your words and also list down 4 majot objectives and provide explanation of lean beliefs towards customer satsfaction? What was the code word used to stop the stagecoach in Night at the Museum? This major body of water is 300 miles north of the capital of Mongolia? When layout cemetery how many graves per acre? Do people threaten the Great Barrier Reef? How many gallons of water in the Caspian Sea? What is crater lake's? What 2 bodies of water does the panama canal connects? Where is the worlds largest tram going up a mountain? Who is the owner of Burj Dubai? Is cedar point the biggest amusement park in the world? Lake Michigan has a depth of 281 meters.what is this measure in kilometers?