How did gaining all this new land from 1800-1850 demonstrate the idea of Manifest Destiny?

Gaining "all this new land" demonstrated manifest Destiny because, with the acquisition of more land, the US was one step closer to stretching from the Atlantic to the Pacific Ocean.

the correct answer is 2.

a slump in geology means a mass movement process of slope failure. a mass of rock or unconsolidated material drops along a slip surface. in other words, rock layers move a short distance down the slope. the slump block is an intact block (2), without any landslide material.

in this image, 1 is the surface of rapture (scarp), 2 the slump block, 3 main scarp (crown), 4 base of rapture with debris flow.

slumps are caused by clear cutting on unstable soils and the sagging of earth, in coastal areas they are due to wave infiltration.