They compared prices at Whole Foods stores in half a dozen cities to those at various competing supermarkets to determine which stores were cheaper. They found that Whole Foods is about 15% more expensive than other conventional supermarkets, such as Kroger, Wegmans, and Safeway.
A type of igneous rock. Basalt is the most common rock type in the earth's crust and makes up most of the ocean floor.
Second, sedimentary rocks form on the bottom of the ocean when particles rain down from the surface. These particles can become compressed and cemented to form limestone. Fossilized sea creatures are often found in these rocks. Most of the mountains around Las Vegas are composed of sedimentary rocks. Red Rock Canyon (photo) provides a spectacular example of both types: the gray mountains are limestone, and the red-and-white hills are sandstone.