ridge-like fold

ridge-ridge transform fault

diagonal ridge for hip roof，vertical ridge for gable roof

upper ridge (upper-level ridge)

distance-true fold (concentric fold)

FOLD ON FOLD

head fold-Cephalic fold

24 m steel ridge

45cm ridge after narrow row solid-seeding

Abnormality of the ridge line

accretion ridge

accretionary ridge

active ridge

aeration ridge

aged ridge

agro-foresty and contour ridge tillage technique

ahead of High-altitude ridge

algal ridge

alluvial ridge