After two half-lives theres only going to be 25% of the original isotope, 75% of the decay product.
The correct answer is A. Andes Mountains.
Explanation
The image shows part of South America and its political division, also, there are letters A, C, D, E, and F. that represent characteristics of that area. Another characteristic of this map is that it has a dark heterogeneous shape that is located transversely in the Pacific zone represented by the Andes. According to the previous description of the image, it is possible to affirm that the letter F represents the mountain range of the Andes because it has two arrows that indicate the dark shape that represents said geological formation. Therefore, the correct answer is A. Andes Mountains.
Because of the sound waves that can travel through walls. Our ears are very intelligent and can process many sounds. Light rays are different though, because objects can block them because the light rays are not as strong as the sound waves.
