Internal hemorrhoids are sometimes painful if they extend outside the anus, or if the blood vessels are clotted (called thrombosed hemorrhoids). 1  First degree: the hemorrhoids remain inside at all times. 2  Second degree: the hemorrhoids extend out of the rectum during a bowel movement but return on their own.
Answers. Best Answer: Rocks can be broken down by physical or chemical weathering. Physical weathering is the cracking, breaking up, and grinding down of rocks into smaller pieces while maintaining the same mineral composition. This type of weathering is caused by a number of different factors. Changing temperatures cause rocks to crack and flake, ice splits rocks open, living things dig or pry open rocks, gravity causes rocks to fall and shatter, and abrasion breaks down rocks with solid particles like sand.
When a rock breaks, it is called brittle deformation. Any material that breaks into pieces exhibits brittle behavior. When rocks bend or flow, like clay, it is called ductile deformation.