Potassium-argon dating is used in geology and archeology to date sedimentary rocks. potassium 40 decays by two different paths: 4040019201kcae−→+(89.3%)4040019 181kare→+(10.7%)the overall half-life of for the decay of potassium-40 is 1.3 x 109 years. estimate the age of sedimentary rocks with an argon 40 to potassium 40 ratio of 0.0102.

What term is given to the border between the central alps and the southern limestone alps?

¿qué parte de la patagonia está en peligro de exinción por su sobrepesca?

Which ecosystem best fits the characteristics listed below? which ecosystem best fits the characteristics listed below? ii. seasonal migrations of millions of wildebeests, zebras, and elephants iii. large numbers of predators, such as lions iv. acacia trees and grasses a. the congo rainforest b. the african mangroves c. the serengeti grasslands d. the sahel