Leukocyte Esterase. Leukocyte esterase is an enzyme present in most white blood cells (WBCs). A few white blood cells are normally present in urine and usually give a negative chemical test result. When the number of WBCs in urine increases significantly, this screening test will become positive.
Land subsidence occurs when large amounts of groundwater have been withdrawn from certain types of rocks, such as fine-grained sediments. The rock compacts because the water is partly responsible for holding the ground up. When the water is withdrawn, the rocks falls in on itself.
-most recent glaciaiton of earth. -reached its max extent between 21,000 and 18,000 years ago. -ended about 10,000 years ago. -caused lower sea level because more ice covered the land. -lower sea level from ice covering land. -more contential dry land. -caused isotatic rebound of land that was previously glaciated.