ancient granite crust is dated using potassium-40. Scientists find that 50% of the potassium-40 has decayed to form argon-40. Approximately how old is this rock

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Answerencourage alternative timber sources,increase public awareness of the forests,increase research into forestry,involve local communities in forest projectsalso one of the main initiatives of the 1977 act was to introduce a new approach to forest management known as selective management system, this is recognised as one of the most sustainable approaches to tropical forestry management in the world