Which theory asserts that, in a two-party race, if voters select candidates on the basis of ideology and everyone participates equally, the party closer to the middle will win?

Middle voter theorem

Explanation:

Middle voter theorem is a theory on which most of the election depend. it stated that party that have median voter is going to be in power.

The two assumption on which Middle voter theorem depend is given below:

1) All the party candidate for particular constituencies are place along one side of political spectrum

2) voter's  have only preference to pick best from all given candidates list.

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.