What is the value of x

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

Give three differences between oceanic and continental crust brainliest will be awarded

Compared with the land in the highlands, the lowlands region of england a) rockier and more difficult for farmingb) the center of business and industryc)richer in coal reservesd)covered by more fertile farmland d) covered by more fertile farmland