Here's a nice web site for showing students the size and density of a meteor and the impact that piece of rock or ice might make on the ground (or in water). It's called Impact Calculator.
You can put in various parameters for the piece of "rock": diameter, trajectory angle, velocity, density of the rock material, density of the landing site, and distance from the impact.
Click Submit and you get the impact values. If you select a place around the world from the dropdown menu and then click on the map, you can see the size of the hypothetical crater. This is under the Crater Size tab.
Look at what you get under the Crater Depth tab. In the interest of this summer's revolving around all things UK, I chose Big Ben as a scale bar for this hypothetical imapct structure.
Saw this on a tweet by eSpatial.
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