Epeirogeny and orogeny, cite the differences.
Epeirogeny and orogeny are two distinct processes under diastrophism that affect the earth's crust differently.
Orogeny is a mountain building process that involves severe folding and deformation of the crust. It affects long and narrow belts of the earth's crust, resulting in the formation of mountains through severe crustal deformation into folds.
Epeirogeny, in contrast, is a continental building process. It involves uplift or warping of large parts of the earth's crust. The deformation in epeirogeny is simple rather than severe, leading to broad regional changes in the crust's elevation.
Explanation
The textbook clearly distinguishes between these two processes under diastrophism. Orogeny relates to mountain building through severe folding affecting narrow belts, while epeirogeny relates to continental building through uplift/warping affecting large parts of the crust. The key differences are: (1) the nature of deformation (severe folding vs simple deformation), (2) the scale affected (narrow belts vs large parts), and (3) the outcome (mountains vs continental uplift).
Solution Steps
Step 1: Identify both processes as part of diastrophism from the context.
Step 2: Extract key differences - nature of deformation, area affected, and outcome.
Step 3: Structure the answer highlighting the contrasting features of both processes.