Starting with the sand Mara adds water to the jar one tablespoon at a time. Water soaks the sample from the bottom up. She counts the number of tablespoons of water it takes to bring the water level up to the top of the sample. She repeats this process for the gravel and soil smaples. Mara adds 4 tablespoons of water to the sand, 7 tablespoons to the gravel, and 5 tablespoons to soil. calculate the porosity of each of Mara's sample using this formula and record the results in the chart. % porosity =(amount of water added to sample divide total sample volume)x100 "Total sample volume" is the amount of soil sand or gravel. A half cup is equal to 8 tablespoons. water added to sample % porosity sand 4 tablespoons gravel 7 tablespoons soil 5 tablespoons

i thinl it is the 1st answer

answer

the statement that best describes president carter’s attempt to free the hostages in iran is c. all of the attempts failed.

explanation

the operation eagle claw conducted by the united states armed forces was a failed mission which aimed to rescue 52 americans captured as hostages in the american embassy, tehran on 24/4/1980.the mission was authorized by president jimmy carter. the failures included;   obstacles in operation that included operational conditions challenges caused by sandstorms, hydraulic problems of one the helicopters and , mechanical failure of another helicopter that was identified as a cracked rotor blade and the crashing of another helicopter during mission abortion causing death of 8 service persons.

c. had saved colonel cresap's family from attack by other native americans.