Answer:
After three half-lives, it is 7:1
Explanation:
- The rate at which the decay of the radioactive isotope is said to be half-life and is represented as the half-life of the atoms and the matter to disintegrate itself.
- The two radioactive isotopes are K 40 and Ar 40. After the K-Ar dating, they contain minerals such as the clay mica and the temphra minerals and Half-life of the K 40 is 1.3 more than 100,000 years i.e 10x9 years for Ar 40.
- <u>Thus the K 40 has to divide as three half-lives have passed if the ratio of argon to potassium atoms is 7:1. At the end of one half-life, the ratio of the number of argon to potassium atoms is 1:1. and two half lives its 3:1 thus after the third half-life it becomes as 7:1.</u>
1. Mountains, stone buildings, stairs/roofing.
2. The geography is mountainous. Very curvy looking, must have been quite a struggle to climb.
3. Pros: You have natural barriers, less invaders.
Cons: You have to travel far just to trade or hunt.
4. They must have been very peaceful and calm people, seeing how they were so isolated from society. Though, Greeks lived in mountains as well and were very brutal. I can’t infer too much about their life but I know that they probably didn’t like being attacked and would rather be away from danger.
first, it's "which" and what are the options?
Underground erosion breaker point
