Answer:
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Explanation:
Siberia is much colder than Western Russia because ocean winds cannot reach Siberia. This wind is warm, which makes Western Russia warmer than Siberia.
Another factor is that Siberia has huge mountainous region preventing warm air from traveling North while cold Arctic air travels South.
A . She gets promotion at work
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>
Comprender la geografía de tiempos pasados y cómo la geografía ha jugado un papel importante en la evolución de las personas, sus ideas, lugares y entornos. Desarrollar un mapa mental de su comunidad, provincia o territorio, país y el mundo para que pueda comprender el "dónde" de lugares y eventos.
