What were some beautiful works of religious art

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

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes.b. it burns more cleanly than crude oil products.c. scientists have developed new ways of extracting it.d. during its extraction, groundwater can be contaminated.

Following lenins death, who took control of the soviet union