An unopened can of coke or pepsi will sink when put in water. an unopened can of diet- coke or diet pepsi will float. try the experiment to verify the assertion. explain the phenomenon.

A can of normal coke or pepsi contains a lot of sugar in a fixed volume of aerated or carbonated water. Whereas a can of diet-coke or diet-pepsi contains a tiny amount of the artificial sweeteners saccharin, acesulfame, aspartame, neotame, and sucralose. These artificial sweeteners give the same amount of sweetness as a few grams of sugar. Thus, the diet-coke or diet-pepsi has less density relative to water than a normal can of coke or pepsi. Thus, a can of greater density than water sinks while the diet-coke/pepsi can floats.

relative dating involves things like higher layers are most recent than rocks lower in the sequence. this can be extended to the known sequence of fossils. rocks containing rabbit fossils are later than those containing dinosaur fossils.  

absolute dating methods mainly use radioactive elements that have known rates of decay and produce recognizable products. for example potassium 40 decays to produce argon. once a rock has solidified the argon is trapped. by measuring the argon and potassium0 you can get an accurate number for the age.  

some other methods are good for archaeological ages. dendrochronology involves recognizing the sequence of tree rings. the orientation of magnetized particles in baked clay can be used to date a fire.

hope this .. .

4.) metal

"-the movement of carbon from the nonliving environment into living things and back to the environment

-carbon is the essential component of proteins, fats, and carbohydrates (which make up all organisms)

-carbon exists in air, water, and living organisms

-producers convert carbon dioxide in the atmosphere into carbohydrates during photosynthesis

-bacteria in the atmosphere cycles through the system in filtration units

-in cellular respiration, carbon is released back into the atmosphere as carbon dioxide

-some carbon is stored in limestone (forming one of the largest "carbon sinks" on earth)

-largest carbon reservoir on earth= limestone

-carbon stored in the bodies of organisms as fat, oils, or other molecules may be released into the soil or air when the organism dies

-this may form deposits of coal, oil, or natural gas (fossil fuels, which increased the atmospheric carbon dioxide)

-fossil fuels store carbon left over from bodies of organisms that died millions of years ago

-they are located in the surface of earth, deep within the earth and beneath the ocean floor."