Extensive landscapes formed by the dissolution of limestone and other carbonate rock and characterized by pitted, bumpy surface topography, poor surface drainage, and well developed solutions channels are known
a. karst topography. b. high tablelands. c. plains. d. basins

A. Karsty Topography

Explanation:

Karsty topography is characterized by numerous caves, sinkholes, fissures, and underground streams and it is usually found regions of high rainfall where bedrock consists of carbonate-rich rock, such as limestone, which is easily dissolvable

answer; seasons change because earth tilts on its axis; and the angle of the tilt causes the northern and southern hemisphere to trade places throughout the year;

the first phase of the government’s plan for settlement was building the transcontinental railroad. the railroad provided a way to bring settlers and manufactured goods west and ship their agricultural and mining produce east. the transcontinental railroad was an essential artery for rapid development of the frontier.

the second phase of the government’s plan was a liberal land distribution policy that made it possible for many people to homestead. with these two key elements—transportation and cheap land—the government rapidly achieved its goal of persuading people to move west, settle on farms, and push back the frontier.