Which is evidence that supports the dynamo theory?

a. silicon is a conductive material.
b. convection occurs in the mantle very slowly.
c. iron does not conduct electricity.
d. earth's core contains mostly iron and nickel.

You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. the ph lowers slightly but is approximately unchanged, and still remains acidic. what can you say about the solution? a. it is a buffer solution. b. it is not a buffer solution it is a strong acid solution. d. the solution has been neutralized. e. the solution has excess acid present

What would happen to a volleyball left outside in the winter? o o o o a. it would expand. b. it would lose air. c. it would shrink. d. it would explode.

In in , is to a 28.4-g (1-oz)−23.0 °c to −1.0 °c?