*Earth Science* How many atoms of a radioactive parent element would be left in a rock that is 2 million years old if the half-life of the parent is 2 million years and the original amount of the parent is 32 atoms? a. 4
b. 16
c. 32
d. 8

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Hlo Good Morning

Radiometric dating uses known rates of radioactive decay to determine the age of a rock sample. 2. After 1 million years, there would be (1/2) (20 mg) 10 mg of parent isotope remaining. After 2 million years, (1/2) (1/2) (20 mg) 5 mg of parent isotope would remain.

sand 60

clay 10

silt 30

sandy loam should be dominated by the sand. as the amount of sand increased, the amount of slit needed to anchor the plants' roots to the sand will also be increased. even though the amount is very little, 10% part of clay is still necessary for proper oxidation.