4. which of the following naturally occurring radioisotopes would be most useful in dating objects thought to be millions of years old? (1 point) a. carbon14; t1/2= 5.73 x 103 years b. potassium40; t1/2= 1.28 x 109 years c. thorium234; t1/2= 25 days d. radon222; t1/2= 3.8 days

This active feature of earth's crust in building mountain ranges as well as islands. this feature is a a) cavern. b) earthquake. c) mountain. d) volcano.

How to convert a density of 0.791g/cm3 to lb/ft3

Each of the following reactions is allowed to come to equilibrium and then the volume is changed as indicated. predict the effect (shift right, shift left, or no effect) of the indicated volume change. drag the appropriate items to their respective bins. co(g) + h2o(g) < => co2(g) + h2(g) (volume is decreased) pcl3(g) + cl2(g) < => pcl5(g) (volume is increased) caco3(s)< => cao(s) + co2(g) (volume is increased)