Right answer gets brainliest+5 stars. jenny finds a sample of a mineral known as zircon in a sample of rock material. she takes it back to her laboratory and measures the amount of radioactive uranium in it compared to the amount of radioactive lead. what additional piece of information must jenny have in order to determine the age of the zircon? a) the ages of any fossils found near her sample of zircon b) the decay rates of radioactive uranium and lead c) the thickness of sedimentary rock layers found near the zircon d) the density of the rock in which the zircon was found

B) the decay rates of radioactive uranium and lead

Explanation:

As we know that when she found the substance it must have some fixed ratio of radioactive uranium and Lead in that substance.

Here since Uranium is radioactive substance so it will continuously convert into Lead and this ratio will change with time

So here we can say that the ratio of radioactive uranium and lead will depend on its decay rate

now to find the age of the substance we can find the present ratio of lead and uranium in that substance and then compare it with freshly prepared substance.

so by the formula

we can find the age of the sample

the higher the current the higher the mag field around it the higher the influence on the compass