Read the article and answer the question.

Theory of Plate Tectonics

The continents of Africa and South America used to "fit together” like puzzle pieces. About how far back in time would you have to go to find the formation of the Atlantic ocean?

600 million years
430 million years
200 million years
90 million years

What happens to an isotope during radioactive decay?

If there's a small amount of friction between two surfaces, the result could be select all that applya. no movement b. heatc. a little bit of movementd. sliding around

Which of the following describe possible scenarios? a) an object has zero instantaneous velocity and non-zero acceleration. b) an object has negative acceleration and is speeding up. c) an object has positive acceleration and constant velocity. d) an object has positive velocity and zero acceleration. e) an object has increasing positive position and negative velocity. f) an object has decreasing positive position and negative acceleration.