Answers: 2
Geography, 22.06.2019 14:40, thezbell
Geologists know that potassium-40 decays to argon-40, with a half-life of 1.3 billion years. if an analysis of a feldspar crystal in a sample of granite shows that 75 percent of the potassium-40 atoms have decayed to form argon-40, what is the age of the granite
Answers: 2
Geography, 23.06.2019 15:10, annehansen833
During which era in earth's history were the first insects? mesozoic precambrian cenozoic paleozoic
Answers: 3
Geography, 23.06.2019 17:00, alyssaxsanchez
Afootpath is to be constructed in a park in the shape of a parallelogram. when a coordinate plane is laid over a map of the park, the vertices of the footpath are (-4,2) (8,2) (11,7) and (-1,7). what is the perimeter of this path
Answers: 3
Which of the following is a a mandatory spending program...
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