Many cuts of beef now meet the USDA's regulations to qualify as lean or extra lean. 1  Of these, the following are considered extra lean: 2  Eye of round roast and steak. 3  Sirloin tip side steak. 4  Top round roast and steak. 5  Bottom round roast and steak. 6  Top sirloin steak.
Some varieties of Limestone are more porous than others. In general, limestone countertops are porous and vulnerable to stains. Water and soap spills need to be wiped right to prevent staining.Acid substances such as vinegar, lemon juice and ammonia will cause surface discoloration and etching.n general, limestone countertops are porous and vulnerable to stains. Water and soap spills need to be wiped right to prevent staining. Acid substances such as vinegar, lemon juice and ammonia will cause surface discoloration and etching.
9 - Exponential porosity-depth curves for limestones and dolomites. Dolomite porosity is lower in near surface but does not decrease as rapidly with depth. [larger image]. There is a marked visual difference between the limestone and dolomite porosity-depth curves of Figure 9.Statistical tests (Snedecor and Cochran, 1980, p. 385) confirm that both the slopes and intercepts of these curves differ at a confidence level greater than 99%. - Exponential porosity-depth curves for limestones and dolomites. Dolomite porosity is lower in near surface but does not decrease as rapidly with depth. [larger image]. There is a marked visual difference between the limestone and dolomite porosity-depth curves of Figure 9.