Oxidation as a cause of chemical weathering is most often associated with which substance contained in the rock? a. iron b. water c. oxygen d. uranium

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Oxidation is commonly associated with iron in rocks.  This is commonly seen by the formation of iron oxide which gives the rock a red appearance

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.