Answer:
The age of the rock is 2.23x10⁹ years.
Explanation:
The age of the rock can be calculated using the following equation:
(1)
Where:
t: is the age of the rock =?
: is the half-life of ⁴⁰K = 1.248x10⁹ years
: is the quantity of ⁴⁰K in the sample = 281.8x10⁻⁹ mol
: is the quantity of ⁴⁰Ar in the sample = 7.25x10⁻⁹ mol
10.9%: is the percent of ⁴⁰Ar production by the decay of ⁴⁰K
By entering the above values into equation (1) we have:
Therefore, the age of the rock is 2.23x10⁹ years.
I hope it helps you!
Answer:
a layer of subsoil must have porosity. That is, it must have empty spaces, or pores. In order to allow groundwater to easily pass through the subsoil, A. the subsoil's pores must be large
Explanation:
I believe ur answer is b. Is not stored in vesicles but is made on demand.
hope this helps.