B. Marco Polo, I just got this answer right on my test
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>
On Unification Day, October 3, 1990, the German Democratic Republic (GDR) ceased to exist and joined the Federal Republic of Germany (FRG). This was the result of several years of pressure from Western nations and the weaning of Soviet support. What was left was a democracy.
Answer:so if 4.6M = 4.6 billion years, then 1m = 1billion years so...
1m = billion years
1cm= 1000 million years
1mm= 1million years.
Explanation: you can solve this by doing conversion or write down each years value. Since Cm is lower than M, so we know it will be in the thousands of millions. Since mm is lower than cm it will be in the one’s place.
Answer:example of the Levallois technique of the Middle Paleolithic.
Explanation:
Levallois technique is the term used to ascribe to the production of a stone tool by striking the core to remove flakes from a stone core before detaching the final stone which has resemblance to a turtle shell.
Levallois has been traced by Archeologists to have been used by modern man during the Middle Stone Age of the Middle Paleolithic Acheulean era.
