An impediment is anything that slows or blocks progress. It can refer to a physical thing, like a fallen tree in the road, or something more intangible, like how piracy is an impediment to the pleasure cruise industry in Somalia. See the pedi in there?
An oblique fracture is when the break has a curved or sloped pattern. A comminuted fracture is when the bone breaks into several pieces. A buckled fracture, also known as an impacted fracture, is one whose ends are driven into each other. This is commonly seen in arm fractures in children.
To most geologists, the term acid test means placing a drop of dilute (5% to 10%) hydrochloric acid on a rock or mineral and watching for bubbles of carbon dioxide gas to be released. The bubbles signal the presence of carbonate minerals such as calcite, dolomite or one of the minerals listed in Table 1.alcite and other carbonate minerals have a low resistance to weathering and can be attacked by acids in natural waters and soils. When testing material that has been exposed at Earth's surface it is very important to test unweathered material. A fresh surface can usually be obtained by breaking the rock.