Chemistry, 20.09.2019 17:20 Lizzy527663
Apaleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive isotope potassium-40. the rock now contains 3 mg of potassium-40. the half-life of patassium-40 is 1.3 billion years. about how old is the rock? a. 0.4 billion yearsb. 0.3 billion yearsc. 1.3 billion yearsd. 2.6 billion yearse. 5.2 billion years
Answers: 3
Chemistry, 22.06.2019 03:00, HHHHHHHHHMMMMMMMMM
About 70 percent of the earth's surface is water-covered, and about 96.5 percent of all earth's water is salt water. identify the watery feature on earth that is made of freshwater rather than salt water. a) bay b) glacier c) ocean d) sea it is not incomplete this is the true question
Answers: 1
Chemistry, 22.06.2019 04:00, amandasantiago2001
Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.
Answers: 3
Chemistry, 22.06.2019 11:30, chelseychew32
What is the main reason why some developing countries fear the increase the free trade policies around the world?
Answers: 2
Apaleontologist estimates that when a particular rock formed, it contained 12 mg of the radioactive...
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