Much of northern Missouri is made of plains with flat grassy areas. On these plains, there are some large boulders that weigh several tons. Which of the following processes is responsible for the presence of these boulders in the plains?

Astudent poured a solution of bromothymol blue indicator into three test tubes. then he placed an aquatic plant in two of the test tubes, as shown below. he placed a stopper on each test tube and placed them all in the dark for 24 hours. bromothymol blue turns from blue to yellow in the presence of co2