What are the main elements of an aditorial?!?

Editorials are typically published on a dedicated page, called the editorial page, which often features letters to the editor from members of the public; the page opposite this page is called the op-ed page and frequently contains opinion pieces (hence the name think pieces) by writers not directly affiliated

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.

i would say b. research typically uses a variety of sources