Who proposed a cycle of erosion in which landscapes progress from high, rugged, tectonically-formed mountains of youth to worn-down plains of old age and tectonic stability?

Witch one is it soo it the the question b.a,b,c,d

17. the soil erosion pictured here is the result of what? a. harvesting renewable resources at a rate greater than the sustainable yield b. a mudslide caused by excessive rains c. harvesting renewable resources at a rate lower than the sustainable yield d. the transition between geologic eras and eons

Religious conflict in northern ireland started with a) cultural differences resulting from viking invasions around 800 b) england’s split from the catholic church in the 1500s c) rebellions in ireland between 1916 and 1921 d) the norman invasion of england in 1066