What pair of muscles produces the duck-face?

This muscle wrinkles the chin and protrudes the lower lip, as seen here.

This atmospheric lifting mechanism involves a geographic barrier such as a mountain: _____.

Atmospheric water vapor needs to condense for the clouds to form.

This layer of the atmosphere gradually thins out into interplanetary space: __________.

Industrial capitalism

The Enforcement Acts, passed by Congress in 1870 and 1871, were designed to

Sharecropping and the crop-lien system

What was ironic about the Confederate government?

American Colonization Society