Scientists use the theory of plate tectonics to understand the reasons volcanoes develop in certain locations. How does this show the validity of the theory?

A. The scientists are using observations.
B. The scientists are making predictions.
C. The scientists can see the plates moving beneath the volcano.
D. The scientists are repeating the experiments .

Here’s one way to follow the scientific method. place the missing steps in the correct position in the process

What three natural resources are found in the great lakes region

Modern pennies are composed of zinc coated with copper. a student determines the mass of a penny to be 2.482 g and then makes several scratches in the copper coaling (to expose the underlying zinc). the student puts the scratched penny in hydrochloric acid, where the following reaction occurs between the zinc and the hcl (the copper remains undissolved): zn(s) + 2 hcl(aq) → h2(g) + zncl(aq)the student collects the hydrogen produced over water at 25 °c. the collected gas occupies a volume of 0.899 l at a total pressure of 79 j mmhg. calculate the percent zinc (by mass) in the penny. (assume that all the zn in the penny dissolves.)