How does the width of the black Iodine starch complex of each potato block compare to the others? Why?

Which of the following statements is true? 1. the mantle of the earth is made of solid nickel and iron. 2. the crust of the earth is made of solid nickel and iron. 3. the inner core is made of solid nickel and iron.

If scientists are wrong about earth's age based on radioactive material and the decay rates are really much faster, how would nuclear power plants be affected?

Use the drop down menus to match each example to the fossil topic discussed then to show how the fossil record gives evidence of evolution