Please help im in a test

Ok, I have not done that test before, so I am just going to wing it...

The rock wall will erode at a steady rate due to the water. This could cause the Niagara Falls to spread and become bigger, or the walls behind the water could start curving inward.

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.

the use of electrical signals that transit messages is know as