Which one is not true of deep ocean trenches? a. they are associated with mid ocean ridges b. they are part of active continental margins c. they are sites where plates plunge back into the mantle d. they are long and narrow depressions at subduction zones

the abdomen (less formally called the belly, stomach, tummy or midriff) constitutes the part of the body between the thorax (chest) and pelvis, in humans and in other vertebrates. the region occupied by the abdomen is termed the abdominal cavity. the stomach secretes acid and enzymes that digest food. ridges of muscle tissue called rugae line the stomach. the stomach muscles contract periodically, churning food to enhance digestion. the pyloric sphincter is a muscular valve that opens to allow food to pass from the stomach to the small intestine.

not only is it colder, it also becomes darker, less salty, and more dense.