What is some entertianment in nigeria

What's erosion? a. the breakdown of rock into smaller pieces b. the removal of weathered products from rock c. a change in rock resulting from exposure to water d. a chemical change in rock that weakens it

What first caused people to consider that the continents were once one large landmass?

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!