Answer:
potassium-argon dating
Explanation:
Potassium-argon (K-Ar) dating technique is the most appropriate dating method for establishing the age of a volcanic ash. It is most applicable for dating minerals and rocks more than 100,000 years old. It is based on measuring the product of the radioactive decay of an isotope of potassium (k) into argon (Ar). Since potassium is a common element found in many volcanic ash layer, the time since re-crystallization is calculated by measuring the ratio of the amount of argon 40 (Ar-40) accumulated to the amount of potassium 40 (K-40) remaining in these volcanic ashes.
The question that Bill Clinton calls the urgent question of our time is weather or not we can make change a friend to us instead of it being an enemy. Basically ,he is saying we need to be flexible and ready to change because he believed that change was good for the country.
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So there's actually two answers to this question. The Gulf Stream is part of the reason why Britain is warmer, since it carries so much warm water, but the difference between a maritime and a continental climate is more important. At the latitudes of Canada and Britain, the prevailing winds are coming from the west. If you're in the east, the prevailing winds are gonna have to travel all the way across the ocean, which will lead to it being warmer in the winter, and colder in the summer. If you've got thousands of miles of continent out to windward, your climate will be more extreme. If you're going across the entire ocean, it's gonna be more mild, and predictable. Continents just get hotter and colder than oceans, and this affects the temperature of the atmosphere passing over them.
