A rock sample has 25% of its original radioactive element and the half-life of the element is 1 million years. How old is the sample?
A.)2 Million Years
B.)0 1 Million Years
C.)500.000
D.)50,000

c 500000

Explanation:

the half was 1000000 so it's 2000000 and 25% of that is 500000

surface mining destroys mountain tops, landscapes, forests and wildlife habitats. on top of that, it leads to soil erosion and destruction of agricultural land. the landscape changes can also disrupt river channels and streams, which leads to flooding. which, can destroy plant life and other animals as well.

explanation:

answer; i believe the answer is hydraulic action;